I didn't know birds flying into windows was so uncommon as to be thread-worthy.
Scared the mess outta me for a second. It was a BIG boom. I wondered if someone was trying to kick the door in. That happened once to us. They kicked once, at 11pm. Now that was scary--no idea what, who, how many, etc. All nothing, but you don't know at the time.
I didn't think it was all that common, more retelling the same few stories.