I had just emptied the garbage out of the little trash can on my bus. Since it was cool, I turned on the heat, which blew out at the bottom of the trash can.
Little did I know that the tight seal of the bag around the rim of the can, combined with heated air in the bottom of the can, would turn the bag into a hot-air trash bag!
Believe me, it was a wee bit unnerving to notice it. It took a second for my brain to make sense of what I was seeing 🙂