I was once backed off in the middle of the hand. It was a handheld game and the dealer had already shipped my first card when the suit told her to deal me out. I picked up the card and it was a 7, so I just threw it back at her and picked up my chips and left. If it were a ten or ace, I would have tried to play out the hand as is required by law. Even though I free rolled him, the suit was just happy to see me leave.
Another time I was backed off before I could even buy in. This was at a place where I had never played before. Flyer obv.