On April 6, 2017 at 17:27, Fins said...
I know I once had two lithium CR2032 button cell batteries loose in my pocket, and when they made positive to positive contact, they got very hot and I about ripped my pants off to get them out of the pocket.
I put a 9V battery in my pocket with a bunch of change, thinking that the plastic cap would stay on. I was wrong. As I walked to the back of the shop to meet with the other installers, I suddenly felt a lot of heat and I reached into my pocket to grab everything and get it out. One of the others said he had never seen me move so fast.