 because everybody underestimates how frequently they laugh. Everybody's laughing more than they think they do. So we've recently published a paper to measure people's different experiences of laughter. People really vary a lot in how much they think they laugh, from a lot to very little or none at all. And that does not predict how much they laugh when they're in conversations with friends, but it does predict how much they laugh when they're on their own. The more people think they laugh, the more they laugh when they're on their own.