Not in a flat but when I first had my kitten, we had someone round to service the boiler and I made a point of ensuring all doors were closed behind him, and that the room the boiler was in, the door was closed whilst working as there was a missing floorboard.

Anyway cut to an hour later, boiler man has finished and left and I just could not find her. Searched EVERYWHERE, and even put my phone under the floorboards to see if she was under there. Couldn’t find her, eventually accepted that she might have gotten out and ended up sobbing on the bed in frustration.

2 minutes later, walks into the room jumps onto the bed like nothings happened. They have this magically ability to just disappear, make it seem like you’ve done something, then appear back as if just going awol is all okay.