My favorite quote is from the movie "
They Live". Starring Roddy Piper.
Roddy discovers there are aliens taking over the world. You can only see them with these special sunglasses. At some point in the movie, he's running from the aliens (or the police? been awhile since I saw the movie) and he walks into a bank wearing his special sunglasses and carrying a shotgun. (he probably didnt realize it was a bank when he walked in) and he looks around, and about half the people are aliens, half are human. Realizing that he has to say something to explain the shotgun he says...
"I have come here to chew bubblegum and kick ***...and I'm all out of bubblegum..."
and then a gunfight breaks out between him and a bank guard (think the guard was an alien) and he starts shooting the aliens in the bank.
Best scene in the whole movie.