Except in college bars. College kids don't tip, no matter what.
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Nope, and sometimes they try to pay for their drinks with change. One night, some kid did that (we're talking nickles and pennies!) and my bartender got so mad he threw the money at the wall and told him that if he had to raid the piggy bank to drink that he shouldn't even come in. It was freaky, but kinda funny.
College kids generally have to raid the piggy bank for virtually every expenditure.