An Irishman is welding a car in a repair garage when he accidently sets fire to the seat oh his boss's overalls. The boss runs around in alarm shouting "get the extinguisher and put it out!" The Irish guy walks over to the extinguisher, looks at it for a moment, then does a handstand and lets himself fall face down, hitting the concrete floor hard with his midriff. Luckily, by this time the boss has managed to pat out the flames. "What the f%$* do you think you're playing at?" says the boss. "I could have been badly hurt." "I followed the instructions on the extinguisher sorr. Stand upside down and strike knob on floor."