[ApplegateRanch]

Years ago, at a So-Cal apartment complex we lived at, a neighbor worked for Asplundh a commercial tree “trimming” (butchers!) service.
One afternoon, they finished loading the enclosed deuce and a half dump too late to dump it at the landfill, so he drove it home and parked it on the street to take & empty first thing next morning.
It was late spring or early summer, so the the branches going through their chipper had lots of succulent new growth, and was heavily leaved out.
A bit after midnight, the load spontaneously combusted. Heavy damage to the truck, but no other property damage.

[greeneyes]

Who Knew that such stuff could be so dangerous? SSHHHHH don’t tell anyone else, or you’ll have to have a permit to compost your kitchen scraps.

[Nepeta]

Spontaneous combustion leads to the destruction of a lot of barns.

I once trusted someone to bale up hay while I had to be out of town. When I came home, the hay was gorgeous and green, but when I opened a bale, the interior was...smoking. Essentially, bales of "salad" had been put up...I got those bales out of the barn as fast as I could.

[JRandomFreeper]

That green stuff has lots of Nitrogen in it. It'll do it every time. I generally don't put a lot of high-N stuff in my compost pile. When I did put some horse poop in there, I stuck a thermometer in it and watched the temp go up to 150F.

/johnny