effervescence of the crowd

Effervescence of the crowd is a term used to describe the tendency of people to feed off of a momentary sense of excitement, taking to the streets and appearing briefly to be mobilized for a cause, only for the initial excitement to wear off and for the energy to dissipate (or worse, degenerate into violence and vandalism). This can be related to the yogic idea of a rajasic state, in which apathy has been overcome to reach a state of arousal and activity, but this activity lacks clear, purposeful intention towards a goal.