Angelo Ogbonna missed the crucial penalty as a youthful Blackburn dumped West Ham out of the Carabao Cup 10-9 on spot-kicks.
After 19 successful penalties Ogbonna's effort crashed off the underside of the crossbar to send Championship Rovers through to round four following a 2-2 draw at the London Stadium.
It was a deserved win for a callow Rovers side with an average age of just 22 and a half as boss Jon Dahl Tomasson made 11 changes with more than one eye on Sunday's Championship derby against promotion rivals Burnley.