Strange, I had a dream last night I had done just that. I use to live in Doncaster, and I went off to on holiday to spain for 5 days. Then came back and noticed my back door was open. Then i remembered.. before I left the last thing I did was take my rubbish out the back! DOH! I'd left it open the whole 5 days. Nothing touched at all. How f**kin lucky was I?
Then the other day I was packing my bike into the car, and accidently left my brand new bar bag (which was empty) at the side of the road. Realised 5 minutes later, went back and it'd had gone.. grrrr.
When I was a kid, I left my bike in a snicket/gennle for a whole night. Totally forgot about it! And was still there the next day. My brother left his bike at the top of a hill as he nipped round the corner for a pee, and it had gone!
It really is pot luck I think!