Heh! Recently on holiday the sole of one of my rubber sandals split apart; as nothing had broken as such, just become unstuck, I bought a tube of glue at the local supermarket, which looked like a foreigh equivalent of Evostik, and stated "suitable for shoe repairs" on the label.
Repair was readily completed. We all traipsed down to the beach, me in my newly-repaired sandals. Unfortunately it rapidly became obvious that the adhesive was water-soluble, since as soon as they got damp, white foam started emerging from the sides. It looked as if someone had sprayed my foot with shaving foam, or that a rather large seagull had crapped on it.
This persisted on a daily basis for the rest of the holidays until the remainder of the glue finally gave way and I binned the shoes... Have to say, I'm afraid the only reason I kept wearing them was to bait my kids, who needless to say were utterly mortified at being seen out with their loopy Dad and his foaming shoe.
I've probably scarred them for life.
David