A Reddit user discovered that their Ryobi handheld air compressor suddenly caught fire in their car, causing it to burst into flames, melting itself, the car's seats, and parts of the floorboard. The incident was not caused by a faulty tool, but was discovered by the Reddit community. The best guess is that the compressor may have moved around and its power trigger may have been improperly stored, leading to heat buildup over time leading to overheating. There are several steps to ensure the safety of tools and their vehicle.