Fermented Yogurt?

Yeah, that's what I thought too when one of my flatmates handed me a container of yogurt that had been in our fridge for a while and asked, "Is this still good?" I sniffed and thought perhaps that somehow the yogurt had magically been replaced with an odd form of alcoholic beverage. I am not quite sure what might cause yogurt to ferment, but I decided to salvage some and try to make a sourdough starter with it. So far it has worked tremendously well, growing and bubbling like crazy. Today I made my first batch of dough with it. It's the sort of dough that sits around extra long before baking, so it'll be another day or two before I have results, but I'll let you know how it works.