A Hippo is heavy and a Zippo is a little lighter.
Interactive Joke of the Day Mug
Coffee Mug
One is really heavy, the other is a little lighter.
A hippiepotamus
They're really good at it.
Helefino.
Ones green and the other is black
Put them both in the trunk of your car, drive around the block, and see which ones happy to see you afterwards.
Eric Clapton never would have let his bag of coke fall out of a 49th-story window!
Depth perception