We used to charge them up in the cal lab and when someone walked in we would toss it to them, but one of the stupider things we did was throw a couple of ounces of trich (Trichlorotrifluoromethane) (used to clean out gauges before calibrating them, freezes on contact because it evaps a below room temp, yep coulda blinded someone.
Then there's the time they gave us "line pukes" 5 gallons of toulene and some rags to clean the inside of an H-3G, in the winter with the doors closed, we was messed up in minutes to say the least.