A mechanic was removing a cylinder head from the motor of a classic Ford when a well-know heart surgeon entered his workshop in his XA GT Falcon.
"Take a look at this engine doc.I open its heart, take valves out, fix 'em , put them back in and when I finish, it works just like new." the mechanic said.
"So how come I get such a small salary and you get the really big bucks when you and I are doing basically the same work?"
The surgeon paused, leaned over and whispered to the mechanic, "Try doing it with the engine running"
taken from the sunday mail with minor changes