Well... It could sit around long enough to sprout plant life.
When I was a kid, there was a Chuck E Cheese that closed down and I guess the employees had a pizza party before they left.
Every weekend I'd ride my bike by and look in the window at the abandoned video games and noticing the left over pizza that sat in the middle of the large room that the games were in.
After a few months, there was some sort of plant sprouted out from the middle of the pie.
From a caraway seed maybe? I have no idea where it sprout from, but it was pretty gross!