Leaving water bottles in your car during summer is a bad idea—and not just because chemicals from the plastic can leach into your water when it gets hot.
A plastic bottle of water can set your car seat on fire if sunlight hits it at just the right angle, according to House Beautiful. If you don’t believe that, just ask Dioni Amuchastegui, a battery technician with the Idaho Power Company.
Amuchastegui was sitting in his truck during his lunch break when he saw some smoke out of the corner of his eye. He looked over “and noticed light was being refracted through a water bottle and was starting to catch the seat on fire,” Amuchastegui said in a Facebook video. He recorded the clip to warn others about the dangers of leaving plastic water bottles in hot cars.