I once had the CC inform me that one of the passengers was so far gone that he had thrown up in the bus to the aircraft. Old days, well before 9/11, so I went down the back and informed said "gentleman" that he was going to be offloaded. "Who the f**k do you think you are?" was his reasoned reply. His mate, whom I had no problem with, then confirmed his own offloading with "Yeah, who the f**k do you think you are?". It took a while, and the arrival of the police, before they were off the aircraft. Not the first or last time I had experience the gate staff passing the problem to the cabin crew. Usually it manifests itself once airborne, and several times I've had the aircraft met by the police.