Not often, but yeah...if something isn't cooked right or the order is wrong...back it goes.
There is one instance of this that really stands out for me. In the summer of '99 my family went on a trip to Italy. We were out in the countryside in some small town eating at this restaurant where everyone was sitting outdoors. My parents ordered some kind of meat dish and it came out very undercooked, so my dad sent it back. The waiter brought the food out again and my dad still said it was undercooked. This time, the waiter seemed upset and was literally arguing with my dad to not send the food back. It was a weird exchange.
Then the chef comes out. This guy was right out of an old cartoon- he was a huge, muscular, bald-headed dude who stomped outside with the plate, threw it on the table (now fully-cooked), and then pointed at us and said something in Italian to all of the people eating there, who all burst out laughing.
I was the only one who didn't eat that dish. This is key, because the next day my parents and my brother were all experiencing stomach pains and shitting like crazy. The chef must have put something in the food.
