My old house used to have an old floor furnace. The oil furnace was in the crawl space, bolted up to the floor joists, with a grate in the floor that heat came from. That grate was the heat source in the house. You could look through the grate and see the heat exchanger where the combustion took place.
It was a small house, and the grate was right by the living room.. So one night I'm watching tv, the furnace kicks on (you can't help but hear it), and a minute or two later this stench wafts through the house!! "What in the heck is that?" I think. So I look over to see that my dog is looking down through the grate, and there's a whiff of smoke rising up, like some Cherokee war party signal.
I walk over to see, and my dog looks up at me and then back down at the grate. I take a look and there's a cat turd sitting on the heat exchanger, just smoking away!!! Apparently, the dog raided the litter box [again] and decided she had enough of room-temp leftovers, so dropped the thing through the grate and on to the heat exchanger to freshen it up a bit. I lift the grate, remove the offending object, declare "Dinner's ready!" and hand the steaming crunchy morsel to her. I mean, it was hers.
You gotta love it.