Anyone who shakes with their left hand is left handed...

There is a great story located in the OT about a man who killed a tyrannical king (if I'm remembering right). Because of cultural specifics, the left hand was considered unclean and everything was done with the right hand. Thus, when a man entered the king's court, his left side was searched for weapons. The left handed man's weapon, of course, was on his right side. The court guards missed it when they checked him, and he was a hero.

A bit off topic, but there you have it.