Do you have a standard signature at the end of your emails?
I've got a friend that's a contractor in Iraq training Special Forces and Police. His signature is:
"The Spartans do not inquire how many the enemy are, but where they are." AGIS II 427 B.C.
I've used several myself. My 3 favorites are:
"Shoot informants, not drugs" and
"Those who live by the sword get shot by us who don't"
If you've got one you use, send it along. I'd like to see it. If you don't (yet), there's a site at http://coolsig.com that has a bunch of them broken down by categories.