The small-scale proof-of-concept mentioned seems a little flawed to me...the surface area => volume ratio of a small rock can't be compared to a boulder. The ic

The small-scale proof-of-concept mentioned seems a little flawed to me...the surface area => volume ratio of a small rock can't be compared to a boulder. The ice collar formed inside a tupperware container is also very idealized compared to the ice layer that would form in nature. I guess if the ice collar were thick enough, maybe it's possible, but that's quite an ice build-up you would need. It doesn't seem too hard to get a large-scale experiment going to confirm some of this...Myth Busters needs to get on this. Until then, my theory is that this phenomenon is brought to you by the same kind of people that make crop circles :P