On a snowy day, when people are sledding down a nearby hill, you may witness someone gliding slowly down the hill, when out of nowhere a hijacker jumps on top of the sled, stealing a free ride down the slope at the expense of the sled owner. This 'hijacking' is almost always followed by an immediate whitewash.

So why does the hijack take place? One could call it laziness, but it's not like the hijacker doesn't have to walk up the hill again. And the hijacker almost always has a sled of his own, so it's not a crime of necessity. No, a hijack is simply a bonding ritual between sledders, unless they're strangers. Only mean people hijack strange sleds.