Rocks Falling From The Sky!

[Brandi]

Maybe it was falling satellite debris or a meteorite - oh, that would probably have burned a hole in your helmet. OK, I like the bird theory.

I concur!

[PinkBike]

call the FAA - in case an aircraft dropped it and is now as we speak circling endlessly for lack of that one part that fell off that would have allowed them to land

[lph]

Ok, I take it back. It wasn't a bird. Your ideas are much better

[mountainchick]

Being the exceptional geologist that I am (really ) it was a rare form of volcanic rock that has been known to move on its own.

So not really, but thats very weird. Good thing you had the helmet on!