Me and the Exchange Student

Me: Hey, Evan!

Evan: What?

Me: What is brown and sounds like a bell?

Evan: Let me think about it. Hmm.

Me: Dung!

Evan: What is 'dung'?

Me: Manure. Poop.

Evan: Oh. But why does poop sound like a bell?

Me: It's a joke.

Evan: Are you sure?