But not all rude jokes translate well across cultures. Peter McGraw, a professor of marketing and psychology at the University of Colorado Boulder, explains that cultural norms vary so widely, finding a universally funny joke is challenging. "Even something like belching has a cultural element," he says. "In some cultures, to belch at the table is highly offensive. If your child does it, you might laugh because they don"t know any better. In other cultures, it might mean "Thank you, that was a wonderful meal"."