I've noticed a huge increase in static electricity discharges since taking delivery of my Apple Watch. Could the Flouroelastometer band have something to do with this phenomenon?
Rubber (and Flouroelastometer too) acts as an insulator for electricity. Ceramic as well. But if the metal is touching you directly from the Watch and there is a lose ground in either your watch or your home, you touching things could create enough potential difference for a tiny shock.
As a test, to see if it is Apple Watch or not, put a pice of paper, maybe a business card, under the watch. Heart rate monitor won't work btu see if that fixes the problem, if it does then you know it's the watch.