Very nearly a disaster
I'm sure you've guessed what's coming - when I saw the open cupboard door (and distinct lack of cats anywhere else in the flat), I figured it out pretty quickly too. Roo was sitting next to the nice toasty warm boiler, looking like she was about to settle down for a snooze - my greeting to her was less than friendly and she scarpered immediately. This left one missing cat. After calling Coco and searching the flat AGAIN, I deduced that she must have disappeared down The Hole. By this time I was having visions of the fire brigade becoming involved, and was on the verge of being very late for work, so the 10 mins I spent with my head in a cupboard, dangling cat toys down a dark hole, did not go down well. My fiance's name was being cursed to the high heavens.
Eventually I heard a tiny pathetic mewing from inside The Hole so I called her again, but no cat was forthcoming. I then hit upon the idea of rattling the box of kitty treats to fool her into thinking she would get one if she came out. Her head, shoulders and claws appeared instantly, but the space was too narrow for her to manouvre herself up and out of the hole, so I had to reach in, grab her by the scruff of the neck and yank her out.
She was fine - if a bit dusty - and I'm sure she was still munching a spider when I removed her from The Hole. I have a bet on with the fiance that she'll be back in there within a couple of days.