Lloyd Dyer's last-gasp winner gave Leicester City a 4-3 win over Fulham in the League Cup, to heap more misery on under-fire Martin Jol.
Fulham struck first through Hugo Rodallega's close-range strike but two goals in the last four minutes of the first half from Wes Morgan and Chris Wood put Leicester in the ascendancy.
Ignasi Miquel's first Leicester goal gave them breathing space but Rodallega's header reduced the deficit within a minute.
Giorgos Karagounis' stunning free-kick looked to have forced extra time but Dyer's late intervention gave Leicester their eighth straight home win in all competitions and a place in the fifth round for the first time since 2000.
The result will put more pressure on Jol, whose side languish in the bottom half of the Premier League with fixtures against Manchester United and Liverpool to come.
Jol made wholesale changes to the side beaten by Southampton at the weekend, with just Maarten Stekelenburg and Philippe Senderos retained.
After a tentative opening, it was the Premier League side who showed their class after 18 minutes to take the lead.
John Arne Riise burst down the left and his cross was cleverly dummied by Adel Taarabt for Rodallega, who sprung the offside trap and tapped home his second of the season.
Leicester went in to the game with the best home record in the Championship and showed their intent after 35 minutes when Anthony Knockaert's fierce drive was spilled by Stekelenburg, who made amends by blocking the Frenchman's follow-up, while Paul Konchesky could only volley the rebound over from a tight angle.
And they got a deserved equaliser four minutes from the break as centre-back Morgan showed predatory instincts to nod home his first of the campaign after Stekelenburg spilled Knockaert's free-kick.
Fulham were clearly rattled and pressed the self-destruct button on the stroke of half time as Senderos hit a clearance straight against Konchesky and Wood was on hand to slide in at the near post.
The game swung one way and the other within 46 second-half seconds. First, Leicester grabbed a third after 51 minutes when Drinkwater's near-post cross was converted by Miquel's bullet header but Fulham went straight up the other end and netted when Elsad Zverotic's deep cross was powered home by the head of Rodallega.
The game continued at a break-neck pace with Derek Boateng narrowly heading wide, Wood forcing a fine stop from Stekelenburg and Bryan Ruiz going close, only to be denied from point-blank range by Kasper Schmeichel.
Fulham continued to press and were rewarded four minutes from time through a Karagounis free-kick that found Schmeichel's top corner.
But just when extra time looked a certainty, substitutes David Nugent and Dyer combined for the latter to slide in and provide a fourth-round giant killing.
|5||W. Morgan||40' 79'|
|Coach: N. Pearson|
for P. Konchesky 46'
for C. Wood 87'
for A. Knockaert 87'
|Mkhitaryan keeping fingers crossed over injury|
|Casillas left frustrated by Alex Telles red card|
|Anything can happen at King Power Stadium – Away goal lifts Schmeichel|
|Ranieri hails Leicester´s ´big heart´ in Sevilla loss|
|Krasnodar celebrate eighth anniversary by eliminating Fenerbahce|
|Home bird Rooney not suited to China - Phil Neville|
|Ramos rejects claims of bad Real Madrid attitude|
|Porto 0 Juventus 2: Substitutes Pjaca and Alves give Bianconeri command|
|Sevilla 2 Leicester City 1: Vardy´s strike tees up second leg after Schmeichel heroics|
|Madrid lead is not worth anything – Zidane|
|Dropped Bonucci must adapt to the rules – Marotta|
|I cannot do what Man City did at Chelsea - Mourinho withering over FA Cup schedule|
|Marcelo: Real Madrid must learn from horror start at Valencia|
|Manchester United head to Wembley brimming with confidence – Smalling|
|Valencia 2 Real Madrid 1: Zaza stunner hands title hope to Barcelona|
|Manchester United duo Mkhitaryan and Carrick set to miss EFL Cup final|
|Alba: Luis Enrique the best coach for Barca|
|Sorry for that poor guy - Sane apologises after costing punter huge windfall|
|Saint-Etienne 0 Manchester United 1 (0-4 agg): Mkhitaryan on target before injury scare|
|Kessie dreaming of Manchester United move|
|Kane refuses to blame ´incredible´ Wembley for Champions League exit|
|Mkhitaryan limps out of Manchester United Europa League clash|
|De Sciglio back in AC Milan training|
|Perez ´really comfortable´ after settling at Arsenal|
|Lallana signs three-year extension at Liverpool|
|Lyon have already discussed replacing Lacazette - Aulas|
|Low pleased to avoid fatigue after Euro 2016 campaign|
|Some teams are beaten before kick-off - Hazard hails Chelsea home form|
|AFC Champions League Review: Misery for history-making Yuen-ting, Ramires boosts Jiangsu|
|Spalletti not interested in Europa League favourites tag|
|Ventura: Balotelli´s latest signs not positive|
|Vela not expecting Real Sociedad Champions League return|
|Schone renews for two years at Ajax|
|Pochettino calls for patience in Tottenham trophy hunt|
|Demirbay earns two-year Hoffenheim extension|
|Origi eyeing first team place at Liverpool|
|Tottenham legend King encourages Alli to keep his edge|
|Pochettino: Spurs must wait for Rose return|
|Romero eyes Europa League title ahead of birthday trip to Saint-Etienne|
|Mowbray tasked with saving struggling Blackburn|
|Four more years? Celtic´s Dembele not stressing amid Real Madrid links|
|RB Leipzig or Salzburg Champions League ban ´hypothetical´ - UEFA|
|Manchester United have world-class players in every position - Forster|
|James: Zidane´s rotation does not affect Real Madrid|
|Redan to snub Manchester United and sign Ajax deal|
|Giovinco turned down China move ´for now´ - agent|
|Guardiola wanted to destroy Monaco´s 4-4-2, says Fabinho|
|Sagna hails Stones after ´vital´ Manchester City goal|
|Deulofeu loves AC Milan but future ´depends on Barcelona´|
|Monaco lacked intelligence, says frustrated Falcao|
|That is why Manchester City wanted me - Guardiola relishes Champions League thriller|
|Tianjin deny Rooney bid but admit Aubameyang talks|
|Deportivo Saprissa 0 Pachuca 0: Champions League quarter-final evenly poised|
|Gameiro angered by substitution in Atletico win|
|´I give nothing for free´ – Mourinho tells Shaw to learn from Mkhitaryan|
|Champions League quarter-finals still possible for Monaco, says Silva|
|Guardiola asks me for more, more, more - Aguero happy to fight on at Manchester City|
|It was like ice hockey - Monaco vice-president stunned by Champions League clash|
|Proud Griezmann eyes more Atletico history|
|Toure marvels at Caballero heroics in Manchester City-Monaco thriller|
|Buffon hopes to play well against Casillas|
|Schmidt: It is easy to see how Atletico Madrid have reached two finals in three years|
|Falcao penalty miss was key – Jardim|
|Guardiola: If one team can score a thousand, million goals it is Monaco|
|Griezmann hails ´brilliant´ Gameiro as Atletico see off Leverkusen|
|Simeone all smiles after Atletico dismantle Leverkusen|
|Spot-kick revision pays off for Caballero|
|Championship Review: Huddersfield boost top-two hopes, Wednesday beaten|
|Toprak laments bad result as Leverkusen lose at home to Atletico|
|Aguero grapples for glory as strikers shine in Manchester City v Monaco|
|Bayer Leverkusen 2 Atletico Madrid 4: Simeone´s side in control|
|Manchester City 5 Monaco 3: Guardiola´s side prevail in all-time classic|
|AFC Champions League Review: Al Rayyan and Al Ahli off to winning starts|
|Ranieri: Sevilla game can be a turning point for Leicester|
|Allegri confirms Bonucci absence after row|
|Nuno confident Porto can beat Juventus|
|Matthaus encourages Gotze to stay at Dortmund|
|Martial: I love Manchester United and I want to stay|
|I would never force out Manchester United legend Rooney - Mourinho|
|Anderlecht insist Tielemans not leaving on the cheap|
|Leicester can´t afford to live in the past, warns Sampaoli|
|Porto´s home comforts, shot-shy Leicester & Sevilla meet - Champions League in Opta numbers|
|Puyol backs Barcelona for Champions League miracle|
|Sutton´s pie-munching keeper Shaw resigns|
|Coyle leaves struggling Blackburn|
|Sampaoli noncommittal on Sevilla future despite contract offer|
|Higuain backs Dybala to become ´among the best in the world´|
|Ancelotti escapes punishment for middle finger|
|Pie-eating Sutton goalkeeper´s antics under investigation|
|AFC Champions League Review: 2014 winners Wanderers thrashed, Hulk inspires 10 men|
|Zidane reveals Ronaldo´s favourite position|
|Lippi backs Allegri for Juve stay|
|Zidane: Isco knows I love him|
|Rooney returns to United training|
|Higuain confident Juventus can win Champions League|
|Giggs the dream pro-am partner for Manchester United fanatic McIlroy|
|Kane hopes Spurs can get used to Wembley|
|Hazard: I gave everything to come back|
|Like Cantona, Ibrahimovic embraces United pressure - Giggs|
|Wenger: Perez deserves more chances|
|Wenger denies using Sanchez was risky|
|Tite: I wish Messi was born in Brazil|
|Jardim praises ´great striker´ Falcao|
|Reported Barcelona target Sampaoli offered Sevilla extension|
|´Angry´ Messi didn´t celebrate because of criticism – Bauza|
|´He is going to have to do it himself´ – Guardiola backs Aguero|
|Toure backs Sterling and Sane for the top|
|Pique: Barcelona were in deep s*** when Luis Enrique arrived|
|Thoughts of Bayern mauling stopped Wenger from enjoying Arsenal FA Cup win|