Get your hands on some liquid nitrogen and freeze a few bottles of shaving cream, peel off the metal cans and set them in the car....
A. What will that do?
B. What?? Some of the stuff you come up with is, quite frankly, unnerving.....
Lol at the ol' shaving cream trick, Kels it will expand in size as it thaws until the entire car is full. I'm sure you can find videos of this on youtube to get an idea of what it will do.
Hasn't anyone ever microwaved a marshmallow? It's kind if the same thing only it doesn't deflate.
@b.... I know what your talking about and I didn't come up with that, and in all fairness, you asked for it lol
But why on Earth would I put those items inside my car?