hi!
One of the first things I did when I moved into my current apartment was to put translucent sticky plastic over the bedroom window. The bedroom window faces front and I’m on the ground floor, and I had been warned that often the blinds are not enough to prevent people from being able to see in. Also, I don’t much like having my blinds completely shut because I like a bit of sunlight, so the sticky plastic was the perfect solution, and I even did two layers just to make sure. The blind usually stays halfway down as well.
There’s just one more floor above mine in the building, accessible by outdoor metal stairs. There’s also an all-night light in the courtyard for security. This combination results in an interesting reflection on my double-layer-translucent-plastic bedroom window.
This picture was taken in my bedroom late one night right after I moved in. I generally sleep somewhat fitfully, especially in an unfamiliar place, so when I woke up that first night and saw this in the window, half asleep and dream-fuzzy, I kinda freaked out.
Who was saying “HI” to me through my bedroom window in the middle of the night!!? It felt threatening and alien and even after I figured it out, it was hard to fall back asleep, still irrationally feeling that something was outside my window trying to communicate with me. It took about a week to stop feeling spooked whenever I saw the reflection.
These days, it makes me chuckle to think that if it had indeed been some malevolent alien visitation, that they would have introduced themselves with a “hi!”. 
