Why I Don’t Tell Jokes to My Wife

I say to my wife, “I saw a cartoon today . . . a husband and wife are standing in their living room looking at a huge painting on the wall, a portrait of an elderly man in an armchair, and the wife says to the husband, ‘I thought he was your grandfather.'”

My wife says, “Who was the guy?”

“The wife thought he was the husband’s grandfather and the husband thought he was the wife’s grandfather.”

“So why was his picture in the house?”