I was cleaning out a chemical storage closet at work. A hydrogen chloride container leaked out onto some iodine containers. I picked one up (bare handed) and sat it down in the grass. About thirty seconds later, I noticed the steam boiling up from around the bottom of the container. This is about 45 seconds worth of contact.
Edit: Ok, I feel bad. But like... I know one dumbass with a cough that won't go away (7 years and counting) because they wouldn't effing listen to me about DE, another who rolled his tractor on to himself and died. Don't take it lightly man. The bill always comes due. We all do what we have to, lord knows I've done some dumb shit, but it ain't cute to dismiss it.
Dude. If I could guarantee that my sacrifice would also remove some N>1 number of dumbshits who shouldn't be contributing to the ecological load the Earth's ecosystem is bearing, I'd volunteer.