My first experience was Mayhem Fest.
I can't remember All of the bands, but I'll name a few.
Five Finger Death Punch. (As soon as they started playing I got elbowed in the mouth, which was another "first" for me.)
Suicide Silence. (I was hit by a shoe, belt, and wallet. I wasn't expecting that to happen.)
Airbourne. (Only one person in the crowd was excited for these guys, and she was right behind me. She had big breasts, how did I know? Because as they played, she was jumping, and her breasts were hitting the back of my head. It was awkward.)
The Red Chord. (I fell in love with this band.)
Dragon Force. (meh.)
Mastodon. (They weren't very energetic, and were kind of boring live.)
Disturbed. (My favorite band that played, seeing the entire crowd raise their fists in the air was amazing as well.)
Slipknot. (They probably had the most energetic performance out of the rest of the bands. Giving us the bird, and yelling "FUCK YOU" at us, and other stuff, it was pretty awesome. I also remember a guy in the mosh pit in front of me twisted his ankle all the way around, and cried.)