When I was little, I had this book of 101 elephant jokes and I constantly remember bits and pieces of it occassionally when I'm out with my wife. She can't believe I would tell jokes like them. Anyway, this one's a two parter that my dad and I tag teamed on at dinner last week that made her roll her eyes:

Why do ducks have webbed feet?
*** To stomp out forest fires.

Why do elephants have big flat feet?
*** To stomp out burning ducks.