Medical vs Mechanical Care

Doctor walks into a garage and the mechanic said, "Doc you and me we are alike you operate on people I operate on machines. You get someone with a heart problem you can operate and take out his heart and fix him up. I get a machine that will not run and I can take out the distributor and fix him up. Very much the same you and me."

The doc looked at the mechanic and replied "Try it with the motor running!"