Not that i did something on purpose, but i left an extension cord plugged into an electric saw that was sitting on the concrete floor. Walked into the garage and the place where the wires plugged into each other was on fire...strange for sure.
As usual, I have a story that is not exactly an answer to the question, but it is what comes to mind. I was driving a truck in town one day and came upon a car with smoke coming from under the hood. I stopped and grabbed the fire extinguisher and ran over to the smoking car. The driver had the hood up and flames were shooting up. I thought I should try everything available before shooting off the extinguisher, which would cost my employer $ to refill. So I bent over AND BLEW THE FLAMES OUT!