Funny story about a fire extinguisher - my Sophomore year of high school, I was on the soccer team. It was a small school, so I was allowed on the Varsity team. We went to a soccer tournament and placed 2nd, but that's not important.
We stayed in the school's gymnasium, and that night we explored the school. We found a way to get into parts of the school by climbing, windows, some unlocked doors, elevator, stairwells.. it was a large indoor school. We mostly explored while playing "crash crew" [or "ditch 'em" - basically hide-n-go-seek or tag with teams and alot of running] through the place.
When we were done, we explored more and found our way to their auditorium. One kid was screwing around with a fire extinguisher. Now, he squeezed the handle and a little bit came out, but it stopped. He thought it was okay, and squeezed the handle again - and that time, it didn't stop. We covered quite a bit of that auditorium with pink dust.
To keep from getting in trouble, we searched everywhere in the school for cleaning supplies. We found alot and cleaned it to the best of our ability. Luckily, we never were caught. It sucked when it happened, as we were having a great time playing crash crew - but boy is it funny to look back on now!
P.S. - We were boned in the tournament; our host school had a dirt/sand soccer field and we were used to playing on grass. The host team was still the only team to beat us, and they wiped the floor with my team.