Because he got cold feet.
An asymptoad.
Because Joy was stuck on the roof.
Sir. Groan worthy penguin jokes(https://allwrong.wordpress.com/2007/10/05/penguin-riddles/)
Penguini
He had cold feet.
They always get cold feet! I'll show myself out.
The Icebergs
Because only the top 1% can stay above water.