I had a friend who owns a restaurant, and before the controversy of a smoking ban cranked up in our town he had already started having No-smoking Mondays. But when the controversy erupted, he started really promoting it. But his No-Smoking Mondays actually saw a loss of business. His restaurant, around 10 p.m. or so, becomes a hang-out for the drinking college students who, on Mondays, found somewhere else to go.
He tried a no smoking Monday? I hope he didn't test that during Monday night football ;)