I read that thread over at IC mag. Ive told this story many times, but I used to run 4x8 tables of bubba, a very resinous plant by itself. While harvesting a plant must have fell off the back of the table. I didnt notice it until around a 5days later when I was cleaning the room and found the plant. The bud was extremely more resinous than the other plants, which were very caked in resin themselves, And im not talking a little bit, Im talking night and day difference. they looked like they were rolled in keif, then rolled again, and then again for good measure. The smell was much much stronger as well. I never knew why it happend until I read that thread on IC mag about the 5days of darkness.
I have nevre met only one who has actually tried it, only people who say it wont work(without trying it for themselves) and these people usually refer to the 2days of darkness, not 5 so i dont really understand the comparison.
So I do think there is something behind this theory, I actually tried to do it my last harvest but the casey I had was popping nanners so i scrapped the idea after 3days. I think im going to try it again with my masterkush which is a very stable strain. stressed plants do create more resin, check out the crystals on a plant covered in spidermites
I would love to see someone actually test the theory