This morning, mad hammering at the back door at 6.45am - wtf? DS2 was in bed so it wasn't him trying to get in after a big night out and no key.
DH went down to find next-door-but-one teenage DS who wanted to point out that it was pouring with rain and the car window was open, interior of car was soaked. So far, so neighbourly - except - IT'S NOT OUR CAR YOU TWIT!
Our car was parked, as always, in front of the house. This car, nothing like our car, was parked outside the back of neighbour-on-the-other-side house AND ITS NOT HER CAR EITHER. 
AIBU to think that he shouldn't have knocked?