Strange Occurrence

This morning I opened up a few windows to let some fresh air in the house. One of the windows I opened was our bedroom window. While I took Chicky Magoo 1 to preschool, there was a small thunderstorm that lasted about 10-15 minutes. Now, it is sunny and is going to be about 75 degrees today. When I got back, I went into the bedroom and noticed a piece of Styrofoam in the window. I had to take a picture of this because it is so bizarre. Our bedroom is 2 floors up, and the window wasn't opened that much. Check it out!