I never heard of the jelly bracelet thing, but now I’m thinking about how that sort of thing can be way stronger than it looks.
I have some TPU filament that’s stretchy enough to feel flimsy, but after I realized I somehow couldn’t snap it, it became kind of a strength challenge. The strongest guy I know couldn’t snap it, and he bent a 36" pipe wrench once. But then again, there weren’t sex acts on the line.