Mate of mine went out drinking for the day (big gang of us) his teenage son turned up mid afternoon and announced that he was going home to "remodel his bedroom" while Mum and Dad were out. (We were already several drinks in at this point)
Only instruction was not to put his wardrobe in *that* corner of the room. (It's cantilevered out over the stairwell/open living room)
Mate came home late, post curry, brained himself on the now ~6" lower ceiling, realised he could see into No1 sons room, at floor level (the horrors!)
To be fair, the lad hadn't put his wardrobe in the corner, he'd moved his comic collection from the wardrobe to his chest of drawers. And put that in the corner instead. :facepalm:
Think it cost about 5 grand to put right, and reinforce. And redecorate.
(Apparently the comic collection weighed well north of half a tonne, which is a lot of comics)