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They will gladly join in the singing :) so it won't work :)
We had a guy at the military recruitment center, during his psychological evaluation, who took off his boot, put it on the doctor's desk, and rolled it around like a toy car, saying "beep beep." And the psychologist didn't back down; he took off his own boot, put it on the desk, and started chasing the guy around like a police dog... :D :D