What's the biggest surprise you've ever found in your refrigerator?

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So, what's the worst smelling thing you've ever had to clean out of your refrigerator? Most times, I like to keep my refrigerator cleaned out, so that I can see what I have left over. That way food doesn't spoil before I get a chance to use it. And, there's no messy surprises from mystery vegetables tucked away in the back of the fridge, that have long since turned to mush. And, I rarely experience the need to try to guess what a dish used to be. But, sometimes a piece of fruit will slip by and really cause a stink in my refrigerator. Usually that's the worst of it though. The other day, we had a salmon based dish. And, I stored the left over cooked salmon in a container. And, the next day there was an ominous odor surrounding my refrigerator and sink. I was pretty sure it was a stink caused by the cats, but turned out to be the left over fish. Good thing I got to it before the entire refrigerator got infected by the smell. How about you? Do you ever find any unwelcome "surprises" in your refrigerator?