When cat toys disappear in my apartment, I think it’s because I have fairies. Small ones that might live in the radiator and keep things just out of paw’s reach.
When I bang my foot on the edge of the sofa or bed, I think fairies as well. They might find it funny if you hurt yourself.
Fairies are known to play tricks at the expense of humans, since they follow a different set of whimsical ethics than us.
I don’t mind. I ask for toys nicely and they appear by my feet when I turn my head.
When you invite magic into your home, you should expect these kinds of things to happen.