Back in the '70s my dad used to tell a joke about his dad. He said that my grandfather had a job that supported his whole large family while my dad was growing up. But unfortunately technology caught up with him, and he was replaced by a device just this big, and he held his fingers apart to demonstrate.

Then he said the real disaster hit: "And then my mom got one."

Grandma was there when he told it more than once, and thought it was hilarious.

It usually came with another joke about the time he was caught with his pecker in the pickle slicer. He was fired, and so was the pickle slicer.

In the seventies you were expected to tell jokes like that and allowed to laugh at them.