"Videos filmed by attendees at heavy metal concerts 
highlight a collective phenomenon consisting of 101−102
participants commonly referred to as a mosh pit. In mosh
pits, the participants (moshers) move randomly, colliding
with one another in an undirected fashion (Fig. 1(B)).
Qualitatively, this phenomenon resembles the kinetics of
gaseous particles, even though moshers are self-propelled
agents that experience dissipative collisions."
Silverberg et al., “Collective Motion of Moshers at Heavy Metal Concerts,” 2013.