We have a circle outside. We have fires in it but have not had one in over a month, so there is just some ashes and a bit of unburnt wood in it.
Well, we came home a few days ago about 1pm after going out for lunch and found it smoking. That was weird - like I said, we'd not had a fire. We'd only been gone a couple of hours. Wonder if it was trying to start burning? We thought maybe??

RE: School Playground Spontaneously Combusts