When I was flight instructing I was walking past one of our students trying to start a c 150 on the line when his engine caught on fire and he came bailing out of the cockpit so I got in, opened the throttle with mixture off and momentarily started it until it sucked all the excess fuel into the engine and the fire went out. A CAP cadet with a fire extinguisher came over but couldn't pull the pin out to make it work. Would have made a great video.