Three teenage boys were taking a short cut across a church lawn. In perfect view was a large sign which read: Stay off the Grass.

The caretaker yelled to the boys from the gardening shed, "Hey, can't you read?"

The boys paused, looked at each shrugging. Then one of them looked at the sign, still baffled. He cupped his hands over his mouth to form a loud speaker and yelled back, "So who's smoking?"