Damn, you beat me to it. And this was going to be my first Slate correction --- and how satisfying it would have been, swooping in as a Pulp Fiction expert!

So I'll simply add, for those who don't know or remember, that Travolta said this in response to his heroin dealer (played by Eric Stoltz) who boasted:

"I'll take a Pepsi challenge with that Amsterdam s--t any ol' day of the f'n week."