I laughed
Last year when I worked at KI there were a lot of ghost stories that everyone would tell/listen to. Well I worked at Nickelodeon Universe Store and we had a ghost named amy, or amber or something like that.
But there would be days we left the store a mess and we would come in the next day and it would be spotless. Also she was a picky ghost she liked the store to be clean. One time it rained and there was a crap load of people in the store messing it up, so we shut the doors cause it was so full you couldn't move. Well she got angry and all of a sudden the doors flew open and the lights flickered and everyone freaked and left. It was freaky and we always just blamed the ghost.
Or I don't know, maybe there was a cleaning crew who came in the morning?
And who knows, maybe the wind blew the doors open. I've seen the wind from a storm blow open a door before.
I do believe there are some unexplained things that happen in the world, but every little thing cannot instantly be attributed to "ghosts". They say the house I moved into here in Wisconsin is haunted, but every story I've heard about it so far I've seen happen, and found what caused it.