When I was a kid, we had a nice, extremely sharp pair of scissors that were kept in the kitchen drawer and used for everything that required scissors. One day when I was about 14 or 15 I went to get them out of the drawer to cut something out of a magazine and they weren't there.
My mum, dad and I couldn't find them anywhere. It drove us fucking insane for AGES trying to find them. Obviously scissors are easy to replace but we just got really annoyed trying to work out what might have happened to them. We were the only three people living in the house at the time. Eventually we gave up, bought some new scissors.
About a year later my dad was doing some DIY in the kitchen and took some stuff down off a shelf he wanted to replace, including a bright red teapot we'd had for years and which was purely ornamental. We never, ever used it for making tea because it had an annoying dribbly spout. It had been sitting on a high shelf for years, largely out of reach, just looking jolly and decorative.
Anyway - the scissors were inside it.
None of us had put them there.
It would have required standing on a stool or something to even reach the teapot. Deciding to take down a teapot nobody had even touched for about five years in order to place a pair of scissors in it for no fathomable reason was simply not something any of us could possibly have done without noticing/remembering, because it would not have been something you could do without being very conscious of it. It would have been a very active and conscious decision and would have entailed going to get something to stand on and probably wiping a load of dust off the teapot too. What I'm saying is that it wasn't the sort of thing that happens when you're holding something and get distracted and put it down in a weird place without really noticing - not like when you (eg) lose a TV remote and then eventually find it in the fridge or something and realise you must have still had it in your hand when you went to grab a snack while watching TV.
35 years later, if I'm visiting my mum and she says 'Oh, where's my glasses / keys / book / pen' I will invariably say 'Have you checked the haunted teapot?' and she will instantly know what I'm referring to.