If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?
pi * z * z * a
What can you hold in your left hand, but not in your right hand?
Your right hand.
What can you swallow than can also swallow you?
What has a head, a tail, is brown, and has no legs?
What word does this rebus represents?
meta meta meta meta
Metaphor (Meta 4).
How can you get four suits for a dollar?
Buy a deck of cards.
What has hands but can not clap?
What word looks the same backwards and upside down?
What did the beach say when the tide came in?
Long time no sea.
What is the best thing to do if you find a gorilla in your bed?
Sleep somewhere else.