Who knew? It turns out that if you keep a plastic bottle of water in your car, you need to be very mindful of where you leave it. Anyone who has watched a survival reality show knows that water in a clear plastic bottle can work in the same way as a magnifying glass, focusing the sun's light onto one spot. That means if the sun hits a bottle in your automobile just the right way, it could actually start a fire in your car.
While it's unlikely this could happen, since most upholstery is fireproof, extra trash, paper and even clothes could potentially ignite. Watch the video for more.