One day little Johnny asks his father
“Dad, why do grown-ups like to exercise in bed?”
Wife was cooking dinner when she heard little Johnny ask, so she eavesdrops and listens to what her husband will have to say.
Father: “because it makes grown ups happy”
Johnny: “I want to be happy too”
Father: “then you have to wait until you’re a grown up”
Johnny: “but who will exercise with me when I grow up?”
Father: “hopefully when you get married, it will be your wife”
Johnny: “but dad, how come our neighbour Sally exercises with you”
Wife rushes out of the kitchen, ambulance arrives 10 minutes later.