Here's an idea that occurred to me after an unfortunate incident in my freezer. Record a soda can exploding in the freezer after it has been in there too long. It has to have some sort of explosive force that would be cool to watch. There is soda all over my freezer, and I know everyone would be interested in watching this occurrence that no one gets to see.
They'd either have to have to rather sensitive electronic pressure gauge inthere, to record when the can explodes, and trigger the cameras that way... Or they'd have to figure out a way to make it happen 'on cue'. Possibly some liquid gas.