This movie has lots of great moments but Chekov’s interrogation is one of the best:

FBI Agent: All right. Let’s take it from the top.
Chekov: The top of what?
FBI Agent: Name?
Chekov: My name?
FBI Agent: No, my name.
Chekov: I do not know your name.
FBI Agent: You play games with me, mister, and you’re through.
Chekov: I am? May I go now?