AUDIO: Peter McGraw on why April Fools' Day humor works

It’s that silly hoax-filled day again when friends and family try to make fools out of each other. That’s right - April Fools’ Day - a day when even lousy pranks seem to be funny.

And there’s a reason for that, says Peter McGraw, an associate professor in marketing and psychology at CU Boulder’s Leeds School of Business. It’s something he calls “benign violations.”