I was carrying a small stack of barrister bookcases when it collapsed directly onto my forearm. My G-Shock fell off because apparently one of the sections had hit the clasp directly and popped it off of the springbar.
I'm pretty surprised at how shallow and, well, flimsy the springbar is - I would have thought it would be deeper, thicker, and overall more robust.

Oh well - the watch itself was fine. If anyone has a recommendation on where to buy a replacement clasp for a GA-B2100 that...

My G-Shock failed today