To turn off a circuit.......i am guilty of this a few times early on, but not any longer
http://www.youtube.com/watch?v=Gz5SIAntYR0&feature=related
I think that most people would agree that the procedure of short circuiting an outlet, in order to trip the breaker, is unwise.
But remember that for any danger to result, the breaker panel or other equipment must be defective or improperly installed, or unsuitable for the duty.
After all if the HO plugs in a defective extension cord or appliance, with a dead short, the only result SHOULD be the tripping of the breaker (and possibly the main)
Thats what the breaker panel etc is installed for, the use of a defective appliance etc should not result in arc flash danger, fire, explosion, or other hazard.
The breaker does not "know" if the dead short is introduced deliberatly as a careless means of isolating a circuit, or is the result of a damaged appliance cord etc.