Me: Knock Knock.
You: Who's there?
Me: Doctor.
You: Doctor who?
Me: I love that show!
You: Why did you just say that?
Me: I don't know, it just seemed like something funny to say.
You: You've never even seen Dr. Who.
Me: True, but it was funny. It was a funny device within the knock knock structure.
You: But why are you writing stupid knock knock jokes?
Me: Knock knock jokes are the knew porn-ku.
You: Yeah, but that wasn't pornographic.
Me: Oh. pause Knock knock.
You: Who's there?
Me: Who
You: Who who?
Me: Actually, I prefer the term beaver.