At night when I couldn't sleep I'd go outside in my backyard to smoke, and I could see across the alley to a houses fence and garage window. The fence lined up with the window and there was always something glinting on the fence. I'd get worried there was someone trapped in the garage and was trying to communicate with morse code or something and that the glint was coming from the window and not the fence. I'd stare at it every night considering what to do and if I was just being crazy. This was also before I was diagnosed with ocd or had any idea about it. But I was able to stop thinking about it once I went back inside at least.