There was a time where ethylchloride (a.k.a laughing gas) was a big hit at my school. A lot of people did it out in the open at the school football field and no one suspected a thing until teachers noticed the discarded cans. For those of you who are not familiar with it, it's these bad boys they spray onto your skin before piercings.
Anyways, mostly the juniors used these things because the seniors, including me, used marijuana and this was their alternative. I gave it a try and it just gives you a really strong buzz for about 2 minutes and you can't help but laugh. Once it ends you get this major headache that lasts about half the day. Fuck.