Don't feed the bats tonight.
Don't get even -- get odd!
Don't get suckered in by the comments -- they can be terribly misleading. Debug only code. -- Dave Storer
"Don't go around saying the world owes you a living. The world owes you nothing. It was here first." -- Mark Twain
Don't go surfing in South Dakota for a while.
Don't hate yourself in the morning -- sleep till noon.
Don't hit a man when he's down -- kick him; it's easier.
Don't kiss an elephant on the lips today.
Don't knock President Fillmore. He kept us out of Vietnam.
Don't let people drive you crazy when you know it's in walking distance.