“My neighbor tiled my roof for free. He said it was on the house.” While that dad joke might elicit a heavy sigh from family members, experts say a silly pun can alter internal body chemistry and lower stress, potentially providing real health benefits. Dad jokes are uniquely distinguished by their structure, content and comedic devices, according to a study published on PsyArXiv, an open-access preprint repository for psychology research. In analyzing thousands of examples, psychologists Paul