Rave raves are pretty tame by my standards these days. I've seen more interesting things at warehouse squat parties and doofs.
One warehouse party I went to was in an empty lot near the airport. Next door was a yard full of shipping containers. They would have been stacked about 6 or so high and they towered over the party. At some point in the night, a bunch of people went next door to climb said shipping containers. They would have been a good 20m up with no restraints. If they fell it would have been the end of these parties.
At the same party, the police turned up around 1am. They tried to shut down the party by unplugging each stage one at a time. Of course, by the time they got to the last stage, the first few had already started up again. So they scratched that idea. They then closed off the entrances to try to keep more people from coming. That didn't work either because people just made holes in the fence. So they sat around outside for about three or four hours waiting for reinforcements and a warrant to close the party officially. When that time came, they entered in force, unplugged all the generators and killed all the sound - except for the bandstand. The last band that was on was a five piece funk band, with trumpets, trombones and saxophones. I think they managed to get hold of those but the drummer kept going for about half an hour, completely sticking it to the police. I'm not sure if they actually took the sticks off him or if he just got tired but there was definately no better way to end the party.