"Frank: No... you're right, Ed. A parachute not opening... that's a way to die. Getting caught in the gears of a combine... having your nuts bit off by a Laplander, that's the way I wanna go."
I remember when I worked in a garden center, where we also used to blow up baloons, we would keep catching college kids trying to suck helium right out of the tank. I frequently told people "just buy a damn balloon if you're going to suck helium". The tank itelf (which was quite large) had all sort of clearly visible warnings on it that you could get brain damage and such from trying to inhale compressed helium from it. I'll never understand college kids' need to do stuff like that.
It's the fact that they're in between childhood and adulthood, about to have their spirits crushed under the responsibily of being a contributing member of society, and so they want to squeeze any fun they can out of their last couple of years of freedom. Pretty obvious, really.
Theres fun, and then theres stupid. When I was at that stage I went on a road trip to DC with my friends, I didn't huff compressed gasses at the obvious risk of causing serious brain damage.