It is impossible to lick your elbow (busted)
A crocodile can't stick it's tongue out.
A shrimp's heart is in it's head.
People say "Bless you" when you sneeze because when you sneeze,your heart stops for a mili-second.
In a study of 200,000 ostriches over a period of 80 years, no one reported a single case where an ostrich buried its head in the sand.