Donkey: Oh, this is another one of those "onion" things.
Shrek: No, this is one of those "drop it and leave me alone" things.
Donkey: Well, why don't you want to talk about it?
Shrek: Why do you want to talk about it?
Donkey: Why are you answering the question with a question?
Shrek: Why are you asking questions I don't want to answer?
Donkey: Why are you blocking?
Shrek: I'm not blocking.
Donkey: Then why do you have problems expressing your wants?
Shrek: I don't. "I want you to shut up". See? No problem.