I just bought citeniK's Eco Drive Skyhawk and got the strap fixed up and the time set when we had that monster earthquake here in Japan. Fortunately, I'm over 100 miles from the epicenter, but it was still a 6.8 here and it hit me on the tenth floor of a building! It was wild enough to shake everything and knock over all of the bookshelves/free-standing objects.
My watch, though? Trashed. I was trying to help hold stuff up and it just got scratched to heck and back. My TV is pretty trashed, too.
Oh, well. How many people can say they ruined their watch in an earthquake... I'm just glad I'm okay.