Eeriness at Work

So... I work an on campus custodial job from 10:30pm to 1:30am. I also get scared really easily, but this job isn't usually a problem with my fearful personality. Until today. I was wiping down the glass doors. And there are two sets of glass doors at every entrance. I was on the inside side of the outside doors, wheni noticed some smeared fingerprints that wouldn't seem to come off. So I realized that it was on the outside side and moved on. I was wiping one spot and as I pulled away, it read "help" backwards. Let's just say that it terrified me. And went on to tell all of my other coworkers. Hehe