The second one I wanted to nominate before death by cell phone battery was from 28 Days Later :
"Rage."
(Asked in answer to the question "What were the chimps infected with?")
Gets me every time.
These are toilet-talky, but still funny. From Do the Right Thing:
"I'm just a black man, trying to keep his dick hard in a cold, cruel world."
And about a zillion from Putney Swope:
Ad Exec: If you vote for me, I'll put you up. In Puerto Rico. FOR LIFE.
Elderly Ad Exec: I've got Puerto Ricans in my building!
Ad Exec #1: You called my son a fag!
Ad Exec #2: Your son IS a fag!
Ad Exec #1: YOU took him on that picnic!
Commercial Narrator: Jim Keranga of Watts, California is eating a bowl of Ethereal Cereal, the heavenly breakfast. Jim, did you know that Ethereal has 25% more riboflavin than any other cereal on the market? Ethereal also packs the added punch of .002 ESP units of pectin!
Jim Keranga: No shit!