In addition to being annoying, over-reliant on glowsticks and populated almost exclusively by tools, raves can also make you blind.
As many as 29 people were blinded by lasers at a recent rave in Moscow. Apparently, the event used lasers less suited to a party and more appropriate for, say, the Death Star. The giant energy beam was made worse by rain at the outdoor venue, forcing organizers to erect tents that refracted the lasers into the eyes of irritating partygoers.
While this event demonstrates the idiocy of raving, it also perversely justifies all of those morons who wear their sunglasses at night, indoors. After all, you never know when someone might turn on the retina-melting death rays.