Goalkeeper Brian Jensen was the Burnley hero as Chelsea crashed out of the Carling Cup 5-4 on penalties following the 1-1 draw at Stamford Bridge.
Jensen saved from captain Wayne Bridge and John Mikel Obi to put the Coca-Cola Championship side into the quarter-finals after extra-time.
Returning striker Didier Drogba put Chelsea in front in the 27th minute but Burnley substitute Ade Akinbiyi equalised with 20 minutes remaining.
Both sides ended the game with 10 men after Burnley's Steve Caldwell was sent off for a second bookable offence late on, while Franco Di Santo was forced off injured with all Chelsea's substitutes already used.
But Jensen sparked scenes of celebration when he saved Obi's sudden-death spot-kick to put the second-tier side into the last eight.
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