So you can tell them from flamingos !
A redditor
3, duh. (My ex's 9 year old little sister told me this joke, and followed is up with: "and YOU'RE the math guy!" >< Burned.)
Well, mostly to forget.....
He has a big E on his pajamas.
If it didn't stand on any, it would fall over.
Because if he lifted up both legs it would fall over !