I had an engine fire once while starting the engine. I have to admit that (almost) all rational thought left me and I couldn't get out fast enough. I did remember to take the fire extinguisher with me though.
I'm not suprised! According to my PoH. I should sit there craking the starter with the throttle full open and mixture ICO. Would I be alone if thinking that would take some guts? I think, unless I had passengers vacating through the only door I would be pretty much legging it (fire extinguisher or no).