I worked as a security guard for a small company in Windsor, Ontario. One night, I was working in an old abandoned hotel built right on the bank of the Detroit River. The place was old and built mainly with wood frame and, as I was sitting in the office reading, I heard a creak on the floor above me. I waited, heard a second creak, further along the hallway above, then a third creak. Someone was walking the hall on the floor above me.
I grabbed my big Maglite and went up to the 2nd floor. It's a LONG corridor, lined with open room doors. The corridor was dark except for one bare, dim light bulb half way down the hall.
I started walking down the hall, looking carefully in each room, Maglite raised, ready for anything, and tension running high. As I approached one room on my left, I could hear movement. I crept up to the room and looked around the corner, heart racing. When I looked in the room, the door where the balcony used to be was open, and an old curtain was flapping in the wind, making the noise and mixing sounds with the river lapping on the shore directly underneath.
I relaxed a little and continued carefully searching the 2nd and 3rd floor of the hotel, finding nothing.
I returned to the ground floor and walked into the old ballroom. I was still tense, positive that another person was in the building with me. As I walked through the ballroom, I saw movement on my left. Terrified, I turned, ready to hit whoever it is with my flashlight.
That's when I realized it was a mirror.
Now officially freaked out, I thought to myself, "I'm not getting paid enough for this!" and I headed out and finished the rest of my shift in the car.