Cat owners will tell you that nothing in their houses can go right as long as their pets are still around. We’re not saying that cat owners want to get rid of their cats—on the contrary, they would probably adopt 50 more if they had the means to provide for them. That said, it’s very hard to provide those means of the cats you own are currently trying to destroy your home from the inside.
The OP finally discovered why their bathroom sink’s drain kept going missing. While the felines were least expecting it, the OP entered their bathroom and saw their cats trying to remove the drain. We guarantee there’s an entire cache of bathroom sink drains hidden somewhere in the OP’s house.