Which sentence contains a pun?

Responses

Is it strange that they sell cotton candy at the snack bar?
Is it strange that they sell cotton candy at the snack bar? - no response given

The children couldn't wait to get off the school bus!
The children couldn't wait to get off the school bus! - no response given

I have a weighty opinion about the new elephant at the zoo.
I have a weighty opinion about the new elephant at the zoo. - no response given

You can throw peanuts to the monkeys at the zoo.

You can throw peanuts to the monkeys at the zoo.