If you’ve ever taken a few minutes and read an aerosol can before, you’re probably familiar with the printed-on warnings that mention that they should not be left in a place where the temperature can reach 120 degrees or more (via Mashable). This is because any kind of pressurized container, from your dry shampoo to your cooking spray to your Silly String, has contents that do unexpected things when exposed to high temperatures. When the can gets hot, the pressure inside the can increases, and if it gets hot enough and the pressure gets high enough, well, it’s going to blow up.
This situation could have been far worse — had she been driving when it decided to blow up, she could have wrecked her car or been seriously injured by the flying glass (not to mention whatever motorist that could have been hit by the flying can once it exited through her sunroof).
The moral of the story is to just leave the dry shampoo at home or keep it in a bag that you always take to and from your vehicle. While it’s now fall, temperatures have been unseasonably warm as of late in Missouri as well as the rest of the country, so it’s definitely still hot enough for this to be a concern. Don’t leave it in your gym bag all day and for sure do not store it in the center console. While it might not happen, it could, and you don’t want to have a dry shampoo explosion to deal with.