Something happened on the London Underground last Tuesday - I don't know what

I'm posting this anonymously because I don't want people at work knowing I'm the person who reports weird stuff to internet forums. But something happened to me last Tuesday evening on the Piccadilly Line between King's Cross and Russell Square, and I genuinely can't explain it.

I was on the last carriage, maybe 6:45 PM, coming back from work. The train was fairly busy but not rammed. I remember checking my mobile - 6:47 - and then at some point I"looked up and there was maybe 30 seconds where I genuinely couldn't account for what I was looking at. Not a blackout or anything - I was conscious the whole time. But the interior of the train looked... wrong. The proportions didn't match. The window reflections were off.

Then it went back to normal. No one around me seemed to notice anything weird. I got off at my stop (Russell Square) completely unsettled. I haven't been on that line since.

I know how this sounds. Stress-induced dissociation maybe. But it felt real in a way I can't describe. Has anyone else had anything similar on the Underground?

Quite possibly a straightforward episode of depersonalisation or derealisation. It's a dissociative experience where the world doesn't look right and your sense of reality warps temporarily. Very unsettling but perfectly normal neurologically. Stress, lack of sleep, or anxiety can trigger it. Nothing paranormal about it, but it definitely feels eerie when it happens.

The London Underground has a genuinely strange atmosphere. Old tunnels, weird acoustics, artificial lighting. There's something about being underground in a metal tube that can mess with your perception. I've had moments down there where reality felt slightly off, and I'm not a particularly anxious person. Your brain might've just been having a moment in a place that's already unsettling.

The window reflections were off.

This is interesting actually. If you were sitting opposite a window and the train's interior was poorly lit, you'd be seeing mostly reflections. If the train hit a section with different lighting, the reflections would suddenly shift. Could that have been what you experienced?

I've had similar experiences on the Underground and I think it's partly because it's inherently disorienting. No natural light, artificial time (you don't know if it's day or night down there), crowds of strangers, repetitive tunnel sections. It's basically designed to make your brain feel slightly wrong.

Could be something genuinely odd with the Underground itself. There's plenty of folklore about strange things down there - the various "ghost stations," weird phenomena reported by staff. The Underground is old and vast and we don't know all of it. Might be worth looking into reports from other people who use that specific line.