A friend of redditor BigBoppinBill forgot some pizzas in the oven for "a few weeks." The result? A kind of glorious fungal jellyfish.
This calls to mind the timeless wisdom of the Jazz Butcher's classic, loony, over-the-top song, Caroline Wheeler's Birthday Present: "Do you know what happens when you leave a fish in an elevator?/You don't?/Well, here's a clue/Fish is biodegradable/THAT MEANS IT ROTS."
A friend of mine left two pizzas in his oven for a few weeks... (i.imgur.com) (Thanks, Fipi Lele!)