This jokes for Dan.

[TexasDave]

 A mechanic was removing a cylinder head from the motor of a Harley, when he spotted a world-famous heart surgeon in his shop. The heart surgeon was waiting for the service manager to come take a look at his bike.
The mechanic shouted across the garage, "Hey, Doc, can I ask you a question?"
The famous surgeon, a bit surprised, walked over to the mechanic working on the motorcycle.
The mechanic straightened up, wiped his hands on a rag and asked, "So Doc, look at this engine. I also can open hearts, take valves out, fix em, put in new parts and when I finish this will work just like a new one. So how come I get a pittance and you get the really big money, when you and I are doing basically the same work?"
The surgeon paused, smiled and leaned over, and whispered to the mechanic: "Try doing it with the engine running!"

[giantkiller]

Thanks Dave. You can think it's funny. Cause you know how much it hurts to laugh with broken ribs

[Pat Conlon]

Actually, they stop the heart for valve replacements....

Don't laugh Dan, don't sneeze, don't even fart.  

Just breathe, the deeper the better.

Reminds me of a surgeon joke.

This famous surgeon was over having Thanksgiving dinner with some friends. The host was doing a marvelous job slicing up the turkey and he said to his guest, "Hey Doc, look at this, wouldn't I make a great surgeon?"

The Doc said, "Perhaps.....let me see you put the bird back together."

[movenon]

+1 on that "Don't laugh Dan, don't sneeze, don't even fart. "
George