While making breakfast yesterday Lisa opened a 20 oz box of Bisquick pancake batter. The box was new and pristine, and the bag of mix inside was sealed and had no leaks, tears, or holes.
Despite all this, as Lisa was about to open the bag she saw a full grown and very healthy fly merrily making its way among the pancake batter. Remember, this was INSIDE A SEALED BAG.


Argh, hard to see anything in the last shot, but I believe it's crawling around the top center of the bag in that frame.
No matter, here's a video of the oddity.