Very simple. Give a quote. If you know it, give a shout and give one yourself.
I am sorry if this exists. I did a simple search for movie quotes but couldn't come up with any.
That said, of course you can use Google in this day and age to find the source but if you did, we may not know it, but you will always know in the blackness of your heart that you're a dirty rotten cheat.
Also, please be sure to give the full title of the film. If you want to confirm a film title feel free to use Google or Wiki.
Oh, and since waiting for a correct confirmation from the poster can back things up, let's say put the answer in spoiler. I trust you can all resist the urge to check until after you've posted. And while you could check then edit your post… then you'd just make baby-killers look humane.
That said....
"Tell 'em Large Marge sent ya!"
Answer:
! Pee Wee's Big Adventure
