Not exactly what I would consider a one-liner, but try these (test: find the movie each relates to):
"Too much LRAB at Berkley" (easy)
In a Jewish accent, "It works nicely, doesn't it?" (more obscure)
"I'm only a poor, corrupt, official." (easy if you're into classics)
"...not in this ZIP Code..." (not exactly a movie but, WTH!)
"A Democrat" - Really obscure without context so I'll tell you it's a Christmas movie!
"You think I was Born Yesterday or summat?!"
Enough testing...