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1.
Rolling On the Floor Laughing So Hard That Voldemort Uses Avada Kedavra On Me And I Live.

Expression used by Harry Potter fans. But only really cool ones.
HP fan 1: "Did you see the trailer for Vampires suck?!?"
HP Fan 2: "OMG, YEAH! I was ROFLSHTVUAKOMAIL!"
by Sir Giftmonger November 11, 2010