I suspect the police would be called if that happened.:-)
Nah. What I do is first check that my books are on the shelves, then go up to one of the sales people and ask if I can sign my books. I have never been turned down except one time at the Coliseum Bookstore, where the clerk was rude. I didn't both looking for a manager, I just walked out. (the store moved to a different location a few years later, and has since gone out of biz).