Crazy people at the gym(including myself)

I always listen to rock/heavy metal when at the gym cause it gives me a lot of energy to push harder. Anyways I was doing cardio today and one of my favorite songs came on, and I started headbanging like crazy. As you can imagine, headbanging while doing the elliptical gave off the impression I was in pain, but I was actually feeling very well. This lady across from me was giving me a WTF stare. It was kind of funny. Sometimes when I'm lifting weights, in between sets I'll start to jam out playing air guitar and air drums.

Share your crazy stories at the gym.