It happens all the time! Did you ever see the utube video of how to get a cork out of a wine bottle? It's the same principle. You simply wait until the carboy is empty, then place a plastic grocery bag in the top. Tilt the carboy by laying it on the counter, and get the stopper right up to the neck. Blow into the plastic bag until it "fills" the carboy space like a ballon. Then, pull on it, and the stopper pops right out. I'll see if I can find the utube link, to visualize it. It's easy, and no coat hanger or pliers required (although both work, too).