I haven't managed to light any clothing like shirts, shorts and pants on fire yet, but I did learn that it is a smart idea to let the shop warm up before getting busy with the bench grinder. Apparently bulky nylon winter jackets are very flammable

I also learned that when cutting with torches under a car, there may be something flammable on the other side of the floor boards. I was cutting out some exhaust parts that the SawZall wouldn't reach, and I guess the torches got the sheetmetal of the floor hot enough (or there was a hole in the rusty bits) for the underpadding inside to start smoldering. Luckily I wasn't working alone and it was spotted quickly and we keep a water extinguisher handy when doing any oxy-acetalene work.