with my own experiences they occurred over a period of some months. they had a connection with someone who contacted the dead. some things were experienced by several people. it wasn't all seeing ghosts. although the ghost I saw was seen by my father and in the same place and the same colour. although I never told him. my mother had heard the door open and close on the dining room when i'd seen it go round the last couple of stairs and off down the hallway to the dining room. we didn't think ghost. we thought we'd imagined it. no big deal it wasn't until it appeared to my father and scared him as he went off to bed and he later saw it on the stairs that we realised what had happened.
the person responsible for this. i found communicating with someone unseen once in the hallway and another time my parents had gone out for saturday morning field service. for no reason he decided to tell me where they were and their route home. where they stopped for red lights and finally when they pulled up outside the house telling me to go to and have a look. nobody knew where they were working or where they had gone to the shop afterward. lucky guess? not when you've had all of the other things.
the person's room was ice cold although it had heating. he was very skeptical and laughed. but eventually he got rid of the items and dumped them in a bin some way from the house didn't want them in the dustbin.