Jerry was removing some engine valves from a car on the lift when he spotted the famous heart surgeon Dr. Samuel Kaiser, who was standing off to the side, waiting for the service manager.

Jerry, who was somewhat of a loud mouth, shouted across the garage, "Hey Kaiser. Is dat you? Come over here a minute."

The famous surgeon, a bit surprised, walked over to where Jerry was working on the car. Jerry, in a loud voice that all could hear, said argumentatively, "So Mr. fancy doctor, look at this work. I too, take valves out, grind 'em, put in new parts, and when I'm finished, this baby will purr like a kitten. So how come you get the big bucks, when you and me are doing basically the same work?"

Dr. Kaiser, very embarrassed, shook his head and replied in a soft voice, "Try doing your work with the engine running."

 IF YOU LIKE THIS JOKE, YOU'LL LOVE FOUR LETTER WORD!