Yep...me too....I've woken up with things, without things, in and out of all sorts of places......usually at times like that the thing I most notice waking up with is a dreadful hangover. I vaguely remember crashing out at the fairly full flat of some Aussie mates in London with a couple of them deciding I couldn't go to bed fully clothed, so because my jeans were so tight, two of them stood me on my head, got hold of a jeans leg each and shook until I fell out of the bottom! That was fun!
I once woke up on a beach in Corfu in a single sleeping bag with someone else and an awful lot of sand...