Pants and socks - Confused I am!

This morning I woke up to find the oddest thing in my bed. It was a pair of pants and one sock. What's strange about that you might be thinking? Well they weren't mine! I don't have a clue who's they are or how they got there. I could have understood if I'd had a heavy night but it was a relatively quite evening for me. A few drinks a little dancing and then home fore bed. Yes.... On me own. So have I got a little Goldylocks singdrome!!! Who's been sleeping n my bed or is there something more sinister going on? Robin XXX.