WATCH: It used to be that when a guy pissed you off, you could just exchange some grunts and punches and go on your merry way. Things sure have changed over the years.
WATCH: Douchebags have also changed a lot. Here's a look at their style changes over the last century.
WATCH: Even if only a few years have passed, people change. Here's what people are really thinking when you run into them.
WATCH: If there's one fight you want to be sure to avoid, it's one with food. Fights with food do not end pretty.