Stifle yourself
Community College Dean, an academic blogger, posts on coping with unhappy students and on the desirability of “stifling yourself,” mainly so as not to tell the academic slackers what you really think of them.
I saw a different, simpler version on a hatchback in Salida, Colo., yesterday, written with narrow white tape on the rear window: </YOURSELF>
Web-nerd humor.