Lolz, not sure what I would have done if I had a BB gun. On one hand, I don't agree with killing animals I'm not going to eat or who are intent on eating/injuring me.
On the other hand I wouldn't have used it to scare it because then aforementioned flapping/shitting scenario could happen in my kitchen.
On the third hand, I'm not a very good shot and knowing my luck the BB would have bounced off something and lodged itself in my eye!