I can't open anything without using scissors. Have you ever tried to open some cereals? No matter how much grunting and pulling apart the bag (which may stretch just a little) I do, I can't make the seam open. And how about those flimsy, thin plastic containers that hold numerous foodstuffs like pastries, veges, etc.? They snap together nicely, but then try to get them apart. You almost need a crowbar. I wonder how Superman would fare.
And I sincerely believe the physical principles used in the examples above could find a place in the military or space program. Stronger than Kryptonite, I think.