The windows in our building have some kind of reflective coating on them. They are almost like a two-way mirror in NCIS when Gibbs is interrogating someone. The reflection is so good that birds think they are going to land on a tree right next to the building when they are actually crashing into the window.

This happened when I was sitting in my office a few minutes ago and I pooped my pants. The bird left a little moist stain behind. You can see it circled in the above photo and zoomed in on the photo below. I hope it hurt the bird a little bit because I have to go home and change my shorts.