please make sure that they do not roll under the seat of your vehicle. A rogue can, bought a week ago and forgotton was under my drivers side seat. I was trying to adjust my seat and something was in the way, so I just pushed back harder when all of a sudden I hear "sssssssshhhhheeeeee" I jump out of my jeep (i was in my drive way) look under my seat and see black paint spraying all over the place. Seems I punchuerd the side of the can. Black paint all over the place.
moral of the story: don't be stupid and clean out your trucks.