Laughing releases oxytocin—the same bonding hormone released during breast-feeding—and makes us trust the other person more. (And if it’s oxytocin we’re after, laughing is a more socially appropriate activity on a first date than breast-feeding.) Laughter lowers levels of the stress hormone cortisol, allowing us to relax. Laughter also creates a dopamine hit, activating our brain’s pleasure centers. It reinforces our behavior and makes us want to go back for more.
