All i remember is a single scene.
There were multiple boys not older than 15 in a room where there was a draw-well or a pool of some kind that. And there was something swimming inside (an entity of some kind, a ghost or something like that) and one of the boys saw it. I think the creature was showed on screen for a few seconds, but i only remeber that it looked like a person, or even a kid. It was a really creepy scene, and unfortunately that is all i can remember since i wasnt allowed to watch it as i was about 10 when i saw it, and im 17 now. It may have not been in english, and i think it definitely wasnt made before 1990. Probably 1995-2010. I know its not much but i would highly appreciate it if someone recognised what movie it was.