Yep.
Our last house (we moved out 12 months ago).. one morning I got up about 6:15am as usual, was sitting on the bed pulling on my socks and thought I heard a bit of a sound or something, just wrote it off as an anomolie being so early and on auto pilot.. So I leave the bedroom (we had the bedroom door shut as the dishwasher was on the night before and it was a loud ol' clunker), go out to the bathroom and see the back door wide open, the screen door jammed open up top at the hydraulic closing thingy they have... or are they pneumatic? Anyhoo.. and the rear gate to the courtyard jammed open.. It was bin night the night before, so I thought the wife had put the bins out and left everything wide open. so i went back in and had a little go at her, she said no I didn't, I said yes you did and she said no, i didn't put the bins out.. then it all hit me, the sound i heard was someone in our house, on the other side of my bedroom door, heard me rousing and got outta there! Nothing was touched, but I reckon they'd scoped the place inside, found a few lovelies to pinch, and arranged a clear getaway path out the back door.. My wife was a few months pregnant at the time, and it's pretty safe to say if i'd have got my hands on them I'd have seen red and nothing else till they were bleeding on the floor.
Lock your doors. Why not...