According to a witness at the No on H8 show at The Improv in Hollywood on Dec. 16, Twilight star Robert Pattinson, 22, booed a comic who said, "Here's my impression of Heath Ledger," then collapsed and began faking convulsions.
(Ledger died of an accidental prescription drug overdose in January.)
"Robert and his friend went nuts yelling at him," the source tells Us Weekly. "[Pattinson screamed] f--k you! You suck!"