The only thing I can think of was when I was 11 or so and I had eaten some watermelon in my room. I was too lazy to take the plate out of my room or throw it in the trash so I left it on the top of my dresser.
I left it there in the summer. For 4 months. I had a very nice mold culture growing by the time I threw it out.
The mold was fuzzy, and was about an inch thick. HAHAHAHA