What never gives you up, lets you down, runs around, makes you cry, says goodbye, tells lies, or deserts or hurts you?

Someone left this mallet, Oh, no... That letter was upside down. Best if we return it.

What is a penguin's default method of travel?

I roar and I slurp with greedy delight, I swallow your crumbs both day and night. Socks beware when I start to zoom, what am I, devourer of the room?

What does a Riddler yell when they see an absurd answer?