Okay, this sounds fake but it's actually true and I'm still scarred by it.
I was staying in Montreal last summer and our (my family's) hotel was downtown, so at like 9:00pm I decided to go next door to the coffee shop (it was just starting to get dark), and when I came back to the hotel I decided to take the stairs instead of the elevator and when I was walking up, the lights were flickering and it was really secluded and I saw a hockey bag with something in it on one of the landings between floors and there was a puddle of blood under the bag.. I ran upstairs to get my parents and when I went to the location where the bag was at, it wasn't there anymore.

I still have nightmares about it.
I may be schizophrenic, I don't really know.