On the way home, Sunday afternoon, from Scouting trips, we often eat fast food. If we're in a hurry, we eat in the cars/vans.
A Scout I'll call Alex - because his name is Alex - rewrapped and tucked 3/4 of a cheeseburger in the map pocket behind the passenger's seat of my car.
In about ten days, I had to do a thorough inspection of my car because the odor had been becoming unbearable for a couple of days.
Maybe it was the bacteria from his mouth, but the remaining 3/4 cheeseburger was quite fuzzy and green.