Dacher Keltner (Born to Be Good: The Science of a Meaningful Life) speaks out In Defense of Teasing:
The reason teasing is viewed as inherently damaging is that it is too often confused with bullying. But bullying is something different; it’s aggression, pure and simple. Bullies steal, punch, kick, harass and humiliate. Sexual harassers grope, leer and make crude, often threatening passes. They’re pretty ineffectual flirts. By contrast, teasing is a mode of play, no doubt with a sharp edge, in which we provoke to negotiate life’s ambiguities and conflicts. And it is essential to making us fully human.The centrality of teasing in our social evolution is suggested by just how pervasive teasing is in the animal world. Younger monkeys pull the tails of older monkeys. African hunting dogs jump all over one another, much like pad-slapping, joking football players moments before kickoff. In every corner of the world, human adults play peekaboo games to stir a sulking child, children (as early as age 1) mimic nearby adults and teenagers prod one another to gauge romantic interest. In rejecting teasing, we may be losing something vital and necessary to our identity as the most playful of species.
If you’re going to study teasing, and you need student volunteers, there’s only one place to go:
To examine the role nicknames play in helping a community to function, Erin Heerey, now a professor at Bangor University in Wales, and I invited members of a University of Wisconsin fraternity to the laboratory one October, just after what is known as rush week, when pledges angle to gain acceptance at the frat of their choice. We divided the fraternity brothers into groups of four — two high-status “actives,” or established members of the group, and two new low-status “pledges.” We gave each participant two randomly generated initials — “A. D.” or “T. J.” or “H. F.” or “L. I.” — and asked them to generate a nickname and story for each of the other three.Our participants came up with nicknames like “human fly,” “another drunk,” “turkey jerk,” “little impotent,” “anal duck” and “heffer fetcher.” Each tease turned out to be a 30-second morality play. One low-status pledge was known as Taco John. The story behind the nickname was this: The pledge had gotten drunk on 18 shots of Bacardi during a late-night feast at Taco John’s; he then disappeared and was found passed out on the toilet, with his pants around his ankles, holding his genitals. Among other things, the fraternity members were notifying one another about moral boundaries: don’t get too drunk, and keep your private parts to yourself.
In the content and tones of the teases, we uncovered a familiar status dynamic. High-status “actives” teased the “pledges” in sharper, more provocative fashion, putting them in their place. Each “pledge” went after the other low-status pledges with edgy provocations, no doubt jousting for an edge. But when it came to their new high-status brothers, the pledges used teasing to praise. The most popular “pledges” proved to be the more playful teasers and were themselves teased in more flattering fashion: within a couple of weeks of the group’s formation, 30-second teases were demarcating rank.
For all the put-downs, the teasing among frat brothers and pledges did not appear to do any lasting damage. In studying transcripts of these teasing contests, you might expect to find a thrown punch or two. Instead, the fraternity members became better friends after their playful humiliations. Frame-by-frame analyses of the videos of these status contests revealed how this happened. At the punch line of a particular tease, the four brothers would actually burst into laughter (the target, not surprisingly, more quietly). Thanks to the scientific study of laughter, we know that when friends laugh, they laugh in unison, their fight-flight response (e.g., increased blood pressure) is calmed and mirror neurons fire; shared laughter becomes a collective experience, one of coordinated action, cooperative physiology and the establishing of common ground.
Perhaps surprisingly, the momentary pain of being teased can lead to pleasure. During their 15 seconds of humiliation, the targets of teasing displayed common signs of embarrassment — gaze aversion; a coy, nervous smile; a hand touching the face; a head bowed submissively so as to expose the neck; and blushing. These gestures are ancient signs of appeasement that trigger a reconciliation response in most mammals, as they did in our study. The more targets showed these evanescent signs of embarrassment, the more the teasers liked them.
Teasing isn’t just for frat guys:
Romantic teasing provides a way of negotiating the conflicts that send many couples to the therapist’s couch. To explore how playful teasing shores up marital bonds, I asked couples to tease each other using the same nickname paradigm used in the fraternity study. The nicknames they invented drew on the metaphors of love documented by the Berkeley linguistics professor George Lakoff: they made references to each other as food objects (“apple dumpling”) or small animals (“adorable duckling”). The more satisfied the couple, the more the teasing was filled with off-record markers. And in a separate study, partners who managed to tease each other during a conflict — for example, over money or an infidelity — felt more connected after the conflict than those couples who resorted to the earnest criticism many therapists recommend. Teasing actually serves as an antidote to toxic criticism that might otherwise dissolve an intimate bond. Teasing is a battle plan for what Shakespeare called “the merry war.”
Soldiers had been shooting buck shot — often in addition to a full-size musketball, as “buck and ball” — from smoothbores for centuries when the rifle, which accurately shot a single projectile, finally took over the battlefield, but the 
