siltanator t1_j7njj6y wrote on February 8, 2023 at 2:03 AM

When hay gets wet it allows bacteria to grow. This growth of new life creates just enough heat to combust the hay. It’s actually pretty common.

wittgensteins-boat t1_j7nrw37 wrote on February 8, 2023 at 3:05 AM

And the cause of many barns to burn down.

I heard the driver flicked a ciggie butt out the window and that's what lit the hay. It's third hand information so do what you want with it.