Ninja facts from Urbandictionary.com:
Ninjas invented the internet.
Ninjas never wear headbands with the word "Ninja" printed on them.
Ninjas can live in your house secretly for days.
Ninjas can remove their shadow, if needed.
Ninjas invented skateboarding.
Ninjas always land on their feet.
If they don't have feet they will land on their nubs.
Ninjas always move to America when making a new start as a "non-assassin".
Ninjas don't play sports, unless killing is a sport.
Ninjas can remove a spleen in one swift motion.
Ninjas don't sweat.
Bullets can't kill a ninja.
Ninjas can breathe underwater anytime they want.
Ninjas can change clothes in less than one second.
Ninjas don't smoke, but they do use smoke bombs.
Ninjas can crush golfballs with two fingers, any two fingers.
Ninjas have a bad temper when they lose at anything.
They usually cut off the winners head before they have time to gloat.
Ninjas lie all the time, even when the truth serves better, ninjas will lie.