Four years ago i was with my aunt in her office, it was 9 o'clock and she was preparing to get home. nobody was in that place, just my aunt and me.
When she turned off the computer we listened to something getting down the stairs very fast, we were so scared and decided to see what was that. When we looked arround the stairs we just saw a shadown that looks like a human we were so scared...
After that we ran to my aunt's car and went back to home.
PS: that was a real story...