Joke 4: The ocean and the wave

4. Question: What did the ocean say to the penguin?

Answer:

Nothing, it just waved!

The word 'wave' has two meanings in English.
Wave (noun) is the shape water makes in the sea.
Wave (verb) is the action of saying hello or goodbye with your hand.

From: http://learnenglishkids.britishcouncil.org