So a renown heart transplant surgeon bought a vintage Harley motorcycle that he wanted rebuilt. He took it to the mechanic across town who said it would take about 6 to 8 weeks but to come around anytime and check on the progress. About 4 weeks later the heart surgeon showed up at the garage. As he looked over the Harley, the mechanic said, "Doc, look I think we do about the same thing, and I think my job is just as hard as yours. I strip this bike down, pull the engine apart, rebuild the valves and then put it back together better than before. My job is just as hard as yours, what do you think?" The surgeon looked at him for a second and then replied..."try doing it with the engine running!"