How Rude!

Okay, this is the second time this has happened and I haven't figured out who the culprit is yet. I left a pair of pants folded on the floor in the closet, planning on wearing them again today, picked them up, and they had a big wet circle on them.

I know I didn't pee my pants, so somebody is using my pants as an extra litter box! What the...?

These cats have two big litter boxes that I clean twice a day, so why pee on my pants? Are you mad at me? Do I not feed you and pet you enough? I don't buy you enough catnip and kitty toys? What's going on here?

Or is someone just an evil kitty?