Yes, I have done that however, it disturbs my cat. He will stand in front of me and meow. If I don't respond he will paw at me with his nails out until I do. I am usually in deep thought about something and it really irritates me I can't complete whatever it is.
Yes, all the time. One of my coworkers at my last job used to always start singing circus them music at me when I’d go into my zoned out trance, to bring me back to reality. It usually worked. I don’t have anyone at new job to sing circus theme to me anymore -_-
So you snap out of it to find yourself sporting a thick beard and looking up at a billboard that says "Support your District...the 2075 Hunger Games are only two months away."