A couple of years back, me and the Mrs once went for a walk down to the beach. We'd put our jackets on but when we realised how warm it was we hung them up just inside the door and went out without them.
We returned to the house a couple of hours later and realised we'd both left our keys in our jackets. Tried shoulder-barging the door, but just ended up with a sore shoulder. In the end, called my father who turned up with a claw hammer, and I set about the back door with it. Removed the beading round the door frame, slid a credit card in and popped the lock open (Thought that only worked in movies!

).
The odd thing was, we'd only lived there a short time and some of the neighbours out the back (Who I didn't recognise at all) saw what I was doing when they came out into the garden to sort out their laundry, but not one of them thought to challenge me or call the police. Useless buggers.