Flash Mobs: The Power of Mass Engagement
Prank, originality, a great amount of Participants
High spirit, lots of people so it's visible, an impact on the observers
Nej
if the people are good at what they do
good choreography and dress code
Unexpected and well choreographed
The more surprising it is, the better. And it should feel generic, which requires participants to act it out good.
entertainment, the reaction from by standers and the quality of the performance
One that fascinates without scaring or offending the audience
Unexpected, makes people laugh, then think. Same criteria as the Ig Nobel prizes actually.