Crowd surfing

Crowd surfing, also known as body surfing, is the process in which a person is passed overhead from person to person (often during a concert), transferring the person from one part of the venue to another. The "crowd surfer" is passed above everyone's heads, with everyone's hands supporting the person's weight. At most concerts and festivals the crowd surfer will be passed towards a barrier in front of the stage by the crowd, where they will be pulled off and put on their feet by the security stewards. Then, they will be sent back to the side or rear of the crowd at the end of the barrier or they may be ejected from the venue (depending on the policy enforced).
Crowd surfing generally occurs only towards the front of an audience where the crowd is dense enough to support a person's body. It is most popular at metal, punk, rock, rave and indie concerts.
In order to get above everyone's heads, a person can be given a boost, in which one person picks up another to launch them over the people's heads, or they can stage dive.
This has been known to happen to unwilling participants who have been boosted up by others by surprise, in which case, those participants may also be ejected.