Three guys are in a doctor's office. One is a drunk, another's a smoker and the third's a gay guy. The doctor tells each of them that, if they induldge in their bad habit one more time, they will die.
Outside they pass a bar. The drunk says, “I don't care if I die, I need a drink.” The drunk goes into the bar takes a drink and, sure enough, he drops dead.
Meanwhile the smoker and the gay guy are walking along. Then the smoker spots a lit cigarette on the sidewalk. The gay guy looks over and says, “If you bend down to pick that up, we're both dead.”