A plumber attended to a leaking ...

A plumber attended to a leaking faucet at the neurosurgeon`s house. After a two-minute job the plumber demanded $150. The neurosurgeon exclaimed, `I don`t charge this amount even though I am a surgeon." The plumber replied, "I agree, you are right. I too, didn`t either, when I was a surgeon. That`s why I switched to plumbing!"