Yessir, a common problem that's not commonly known these days, but the old timers knew all about it. This is the main reason for steel rag buckets with the spring loaded lids that open with a foot pedal, for putting oily rags in so they don't spontaneously combust and burn places down.
Yup all the mechanic shops have to have these for OSHA's requirments.
You sir, are a specialist in the art of discovering a welcoming outcome of a particular situation....not a mechanic.