Why?

I came home the other night to a strange surprise. Hanging on my door was a pair of pants. They were not my pants. I do not know whose pants they are. There was no note. Just the pants. They are not attractive pants either. High waisted, tapered leg nightmares. Why? Who leaves pants with no warning or anything? And while they are my size, what if they hadn't been? You just don't incorrectly guess a girl's size. Do that and a nice hissy fit is coming your way. Who leave pants? Why?