I saw something I categorically can’t explain, once.
I owned a pub at the time. I was pottering about cleaning up at the end of the night, & was in the lounge bar/restaurant, tidying up.
We would be busy in there until the end of food service, then once diners had left by 10ish we’d often close it so the bartender could knock off early. We had a youngish staff & there was always someone up for doing a 5-11pm shift & heading off into town.
Working that bar was still unpopular, because it was somehow deeply, deeply spooky when it wasn’t busy, & if you ran the bar, you had to clean up after the punters had left. There was a running staff joke about feeling eyes on the back of your neck in there.
Anyway, I was reasonably immune to the woo. Yes, it was rather an unwelcoming room when deserted at night - all inglenooks & fake Tudor beams - but tbh, it mostly bothered me because the business wasn’t doing too well, the dry sales were an issue, & I couldn’t afford to fix the depressing dining room. Still, I didn’t much like lingering in there at midnight, & was wiping the back bar down quite quickly, when I saw a teenage girl in a dark dress walk into the Ladies.
For a second, I thought one of the families from earlier in the night - there was a lot of holiday accommodation in the area which made up the bulk of the summer trade - had somehow left a kid behind. Then I remembered that it was 1am. & then I checked the loo & no one was there.
When I told a couple of the regulars about it next day, they came up with a story of a previous landlord’s 14yo daughter dying of leukemia 70 years previously (because of course they did - bar flies gonna bar fly!). The story didn’t check out - no landlord in the previous century was recorded as having lost an older child.
But. I saw her vividly - I could describe her in detail. I don’t think I saw a ghost. I think the human brain does some weird & wonderful stuff. But I can quite see why people do believe.