One of my former offices was in one of those more environmentally friendly buildings, where the toilets flushed automatically, the sinks only came on when you put your hands in front of the sensor, etc. At first I thought what was happening to me in that building was due to mechanical malfunction, but I no longer think so.
It took a few months for anything out of the ordinary to happen. I would go to the restroom with no strange occurrences. Just your run-of-the-mill public restroom. Then, one day, my co-worker was leaving the restroom as I was entering. I am positive I was in the room alone. As I was in one of the stalls, the automatic sinks came on. Then they turned off. Then they turned on again. Weird, but again, I figured it was the mechanics somehow malfunctioning. I went back to my desk and didn't think anything else of it.
A few days pass and I'm back in the restroom. Alone. This time, the toilets (I believe there were 4) started flushing. All at once, over and over. That one startled me a little, but still - those auto flush things barely work right on most days. I went to the sink to wash my hands, and the auto faucets came on. All of them. At that point, I admit I kicked it into a higher gear and got out of there at a brisk pace.
The next time I had to visit the restroom I was a tiny bit nervous. That time there were no crazy flushing toilets and no sinks turned on by themselves. But - I heard footsteps (like high-heeled shoes clacking on tile) walk across the floor, and I was alone. Perhaps it was a woman walking on the floor above me, but it did not sound like that - it sounded right next to me. As I was contemplating the odd sound, the toilet paper rolls fell to the floor in each stall. Every. Single. One. This was not a matter of I knocked it with my elbow - the paper from 3 stalls down fell and rolled across the floor. That really freaked me out.
After that, I started asking my co-workers if anything odd ever happened to them in the restroom. They all said no. I asked about sinks coming on when they shouldn't, etc. Again - they all said no.
These things only ever happened when I was there alone - and only in the bathroom. Never once did anything happen in my actual office. One co-worker very matter-of-factly said "obviously something is trying to make contact with you. Ask what it wants." A few others suggested it was my mom or dad (who have passed away). I brushed that off because why would my mom or dad contact me in a public restroom at work? Another jokester said it was Moaning Myrtle (Harry Potter reference).
Eventually I got used to the weird happenings - they didn't happen every time I went in there after I started asking around, but on occasion the stall doors would open and close. I was a bit too chicken to ask outright what the entity wanted with me. Now I feel kind of bad. I never felt threatened. Perhaps I could have helped.: (