Sir Alex Ferguson accused his Manchester United players of throwing away points following Sunday's dramatic 2-2 draw with Fulham.
United were denied a victory at Craven Cottage after Brede Hangeland headed home a last-minute equaliser in a thrilling stalemate.
Paul Scholes had fired the visitors ahead with a shot from distance on 12 minutes but Simon Davies hauled Fulham level 15 minutes into the second half.
Hangeland's 84th minute own goal looked to have handed the Red Devils the points but the momentum turned on Nani's missed penalty three minutes later as the giant Norway defender headed home a late corner to earn his side are share of the spoils.
"When you get the opportunity to seal the game with that penalty you should be taking it," Ferguson told MUTV.
"It was a missed opportunity and it galvanised them, got the crowd up and they scored the equaliser in the end.
"When we got that second goal I thought 'we've escaped here'.
"But to miss a penalty kick to make it 3-1, you're throwing two points away there I'm afraid.
"You don't want to be dropping silly points and we dropped silly points here. We can't escape that.
"There was an opportunity to go 3-1 ahead with three minutes left and we didn't take it."