The drums are shaking the very foundation of the building. The lead singer is screaming undecipherable lyrics into the microphone. The crowd is getting really into it, almost violently so - here are the types of people you'll find in your local mosh pit.

1. The Drifters.

These rockers kind of take repeated low-energy walks around the circle, throwing their weight into whoever they happen to come across. There's a certain zen aura around the drifters; they're just soaking up the music.

2. "Herky-jerky."

Was that a cartwheel? You bet it was! These wild moshers get so into the music, they forget that there's anyone else in the room. Limbs are flying, elbows and knees out. They jump over each other in a writhing mass. You can almost guarantee that one of these herky-jerkers is going to take his shirt off before the night is over.

3. The Shovers.

They don't want to get right into the action, necessarily, but the Shovers come to play. They stand on the outside of the circle and push the other moshers back into the middle of the chaos; they're essential to making sure the pit doesn't spread to the rest of the room.

4. That Group of Tiny Girls.

Do these hundred pound girls look like they belong in a mosh pit? Absolutely not. Are they having the time of their lives? Most definitely.

5. The Cup-holders.

The riskiest move in all of the pit: bringing an open beverage container into the action. Maybe these people just haven't felt the alcohol hit their systems yet, but now everyone's drenched in beer.

6. "Above It All."

This last group acts annoyed when someone from the other groups rams into them, but, come on, they're having the time of their lives.

7. The Newbies.

Is it terrifying? Slightly. But once you get into it, it's fun!

Feel the drumbeat pulse through your veins, throw your body weight against one of your neighbors, and pray you don't come out too bruised!