Lookout!!
A colleague of mine very recently had a strange incident. She was in her house when she heard a loud bang. On investigation she found the entire garden covered in what seemed to be crushed ice and a 8" x 8" deep hole in the garden.
Now all we could think of was that it came off a plane as there is no other way it could have got there I can see. She called the airport and was told that if the ice was not coloured then don't worry as it often happens.... is that correct?
I would have worried had I been stood underneath it.....