I've known things about people I had no way of actually knowing. Each time I try and convince myself I'm making stuff up but then am proven right. Sometimes it's regarding the past or present, but often it's the future.
Two have happened in church (simply because it's where I spent a lot of my youth thanks to v religious parents).
I went to choir practice one evening with a friend. She went to park on the church drive as usual but I said she shouldn't as an ambulance couldn't get past if needed. No idea why I said it, in my 20 years of going to the church no emergency vehicles had ever been summoned and people parked there all the time. Anyway she rolled her eyes and duly parked on the road.
Practice over we go into the service. I see my mum sitting on her own near the end of a pew. During the first hymn a man entered the building and sat right next to her, despite the church being 95% empty. I 'knew' immediately he was about to die (but, as usual, refused to believe this notion). Ten minutes later he keeled over onto my mother.
Ambulance couldn't get near the place due to cars on the drive (but at least my friend's wasn't there).
Maybe I realised he looked ill, but nobody near him noticed, despite there being medics nearby who watched him come in. And why had I mentioned an ambulance earlier that evening? Was very strange.
The other church one was during a morning service. The children would be in for 15 mins before heading out to Sunday School. One family wads directly opposite me, though quite a distance away with the altar between us (so not a great view, and I couldn't hear them). Their adopted son was with them, together with another young boy. I knew instantly they were adopting him too, despite there being nothing more in their interactions than if he were a cousin or friend.
Mum spent time with the family at Sunday School so I asked her about them afterwards. She thought I was stupid, and immediately went to ring them to prove me wrong. She was gobsmacked when told that yes, they were hoping to adopt him (but had told nobody so far) and the parents were incredibly touched that I'd figured it out.