I've seen two cars on fire and thought mine was on fire at one point. Mine was when some gauge or other in mine cracked, causing something else to break when it got overheated, and steam to pour forth from my vehicle when I was trapped in rush-hour traffic. Terrified, I managed to pull over off the road a few minutes later and threw myself and everything I needed (purse, phone, iPod, books) out of the car and called roadside assistance. Eventually it stopped, and I realized it probably wasn't going to catch on fire (the difference between steam and smoke not exactly being apparent when you're terrified and trapped in traffic), and got back into the car to get out of the sun while waiting for the tow truck.

One car on fire was just on the side of the road, and the other was in Nairobi. I was in a taxi driving to downtown, and looked down a street as we passed it at breakneck speed and saw a blue car with flames roaring up out of it that were, I think, the height of the two-story building it was next to. If someone told me it had been firebombed instead of catching on fire by itself, I'd believe it. (There was nothing about firebombings in the newspaper the next day, but I don't know how much control of the press the Tanzanian government has.)