From PerezHilton.com:

Robert Pattinson really respects his elders!
At a December No On H8 comedy show at the Improv in Hollywood, the Twilight dreamboat was rather displeased with a comic's "impression" of the late Heath Ledger, which involved the comedian convulsing on the floor.
Apparently Pattinson and his pals started booing and yelling, "F@!k you! You suck!"
"Leave Heath Ledger…
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