Like most things in life, its better at a punk show. If you have cool old school east coast punk people in the pit then it will be harsh and violent but never threatening or dangerous. However, newer, Fight Club inspired moshers might create pits that are simply made for removing teeth and gashing skin. Probably so popular because it allows young white males to let out both violent emotions and sexual frustration in one grand gesture. Plus, if you're with one of those girls you can impress them by coming back alive and with all your teeth.