Two weeks ago, I stored around 20 eggs in a pot and sealed it (that was wrapped inside clean closed trash bag) for storing them safely and placing in the fridge (which I forgot to do...). The eggs were clean prior to storing them in the pot.
Today I opened it and found to my great horror worms swarming all over the pot.
By the design of this accidental experiment, they didn't come from the environment outside the bag, so how did they get there?