The Story of the Office Window

The window at my previous workplace would sometimes be found open even after the security guard had checked and locked everything. Fortunately, it was located in a spot visible from the employee parking lot, so whoever was the last to leave would check it before heading home. If it was open, they'd go back to close it. One day, when my boss and I were the last ones to leave, we checked the window from the parking lot and found it open. Boss: "It's on the second floor and it's already dark. I'll go close it, you can head home." Me: "I'd feel bad leaving you to go close it and heading home first, haha. I'm also a bit curious to see if anything happens, so could I go with you?" So, we went up to the second floor together. We didn't hear any strange noises or anything; we just closed the window and went home for the day. Nothing unusual happened after that, and I transferred to my current job. Every time I meet a close colleague from there, I ask, "Does that window still open on its own?" and apparently, it still does sometimes. (That workplace didn't have any scary rumors or legends associated with it; it was just a normal, good place to work.)