Woman goes to the doctors with a black eye.
she says " its my husband,every time he's drunk he beats me"
Dr say's " the only cure is to hum,when he comes in ranting and raging just hum away to yourself "
She comes back 2 weeks later and says "Dr that was a great idea,he hasnt hit me once. "
The Dr say's " yes, I thought keeping your mouth shut might help "