"Bob's New Look" joke

A man is at work one day when he notices that his male
coworker is wearing an earring. This man knows his coworker
to be a normally conservative fellow and is curious about
his sudden change in "fashion sense."
"Bob, I didn't know you were into earrings." "Oh, yeah,
sure," says Bob sheepishly. "Really? How long have you been
wearing one?" "Ever since my wife found it in our bed."