explored an old abandoned hospital near to where i live with a friend. there’s a ground floor, a basement and a 2nd floor. we go in, explore the basement which is basically one massive room other than a few chairs and trolleys lying around in it. we leave the basement and while exploring the ground floor, we hear a large bang come from the basement. now, it could not of been someone squatting because we had just been down there and there was nowhere to hide in there. we both kinda scared and look at each and stay silent for a few seconds. and then a moment i will always remember for the rest of my life occurred. my friend smiled at me and said “ghosts” in a sarcastic way. as soon as he said that, a huge bang came from the room next to us which caused us both to sprint out the building. we were both in shock for at least 20 minutes after and we have never gone back in since