Crowd surfing is the process in which a person is passed overhead from person to person. The "crowd surfer" is passed above everyone's heads, with everyone's hands supporting the person's weight.
Crowdsurfer at Music Midtown festival, Atlanta, 1997
Headbanging is the act of violently shaking one's head in rhythm with music. It is common in rock, punk, heavy metal and dubstep, where headbanging is often used by musicians on stage. Headbanging is
Crowd surfing
…a performance of Handel's Messiah after he took the director's invitation to "clap and whoop" to the music a step too far by attempting to crowd-surf. Headbanging Moshing…
Dutch death metal band Asphyx headbanging during a performance in 2007
Dave Tyo of Bipolar demonstrating the 'whiplash' technique at CBGB in New York City