Cliff.
A: He Apollo-gized.
On a piece rate.
Cliff ! Cliff who Cliff hanger !
A pun is a play on words, while Cliff's notes are a word on plays
A: An animal that talks your head off.
He forgot his head and shoulders.
If you know that one, try this one: Why do seagulls fly to the dump
Because if they flew by the bay they'd be bagels.