Tabitha one of our office cats loves to play with odd things, rubber bands, paper clips, the little seal on milk jugs, I have never thought anything of it until today....she got the seal of the water jug caught between 2 molars, it cut her lip, gums and the roof of her mouth, it was stuck good, I tried pulling it out for like 10 minutes, my dad came down (it's his day off) to pull it out but as soon as he showed up I got it out. SO just a warning, as we have lots of kitty boarders who bring toys like this in.