Well, I couldn't resist. I have put all my Flashing G-Shock's I could find on a great heap. In my first attempt a few didn't flash. I believe still a few forgot to flash.
Here is the heap in dim light, one minute for the big beep...
And this is the bib beep beep Falsh Flash:
It's actually a "small picture". I will upload a full size for fun in the Images sub-Forum for those who are interested.