I'm sure there's a phantom kitty living here with us. I've felt things and seen flashes out of the corner of my eye. My kitties don't really react too much. Vlad will now and then sit on the bathroom counter and meow, but once I get him he's okay. Maks is always cooing and kitty talking and sometimes I wonder if he might be talking to phantom kitty. They don't ever freak out or hiss or growl, so I think the kitty just wants other kitties to play with. I've come to believe maybe it's one or both of the cats I had in high school.
There are only two rules at my house: House rule #1. Cats rule. House rule #2. See rule #1.