One of the guests turned to a man by his side to criticize the singing of the woman who was trying to entertain them. 
"What a terrible voice! Do you know who she is ?" 
"Yes", was the answer. "She's my wife"
"Oh, I beg your pardon. Of course, it isn't her voice, really. It's the stuff she has to sing. I wonder who wrote that awful song ?" 
"I did", was the answer.