This groom w quiteas nervous at the altar and ended up mixing up his words. While taking the vows, he mistakenly said, "I'll laugh at you when you're sad," causing everyone to burst out laughing.

Nervous laughter is another frequent explanation in psychology. When a person faces a high-stress or anxiety-inducing situation, the body reacts in various ways to manage the emotional overload.

Trump is still trying to make Harris’s laugh a problem. People who know her well explain why. Those who know Harris recognize an old nervous tic.

And reams of other evidence support the idea that living with levity can help people feel better. There are small studies that connect laughter, humor and feeling amused to increases in optimism ...

Laughter is the physical manifestation of pure happiness — and it also has some real health benefits, as shown by these seven amazing things that happen to you and your body when you laugh.

Today, Buell contends that Harris has lost her old habit of laughing when she is nervous. “That’s long past, and she’s matured out of it,” he says.