Great scene - not quite a quote but its close enough.
What does Marsellus Wallace look like?
Brett: What?
Jules Winnfield: What country you from?!
Brett: Wh-what?
Jules Winnfield: What ain't no country I ever heard of! They speak English in What?
Brett: What?
Jules Winnfield: English, mother-fu**er! Do you speak it?!
Brett: Yes.
Jules Winnfield: Then you know what I'm saying?!
Brett: Yes.
Jules Winnfield: Describe what Marsellus Wallace looks like!
Brett: What?
Jules Winnfield: Say "what" again! Say "what" again! I dare you, I double dare you, mother-fu**er! Say "what" one more Goddamn time!
Brett: He's black.
Jules Winnfield: Go on!
Brett: He's bald.
Jules Winnfield: Does he look like a *****?!
Brett: What? Oww!
Jules Winnfield: Does he look like a *****?!
Brett: No!
Jules Winnfield:Then why you trying to fu** him like a *****, Brett?