Knock, knock! Who's there? Cows go. Cows go who? No, cows go moo!
OK, OK. So it's not a side-slapper -- especially if the teller has zero sense of comic timing. But most likely the person sharing the joke over the water cooler thinks he or she is pretty funny.
No matter how badly the joke is told, it will sometimes elicit a few polite laughs.
Because social norms make us averse to providing negative feedback, says Joyce Ehrlinger, a Florida State University assistant professor of psychology whose latest laboratory research recreated everyday interactions in which people might feel pressured to withhold negative information.