Never a good thing.
How’d it end up in there? No idea. It turns out the smell of burning graphite is quite unpleasant, though. Also that of roasting eraser. Really bad. Lingers in the air. Yuck.
On the other hand, it could have been a crayon. Thank God for small favors.
When I was three, I set our family’s kitchen on fire with a Pop-Tart at about 6am one Saturday morning. The toaster popped, but the Pop-Tart jammed it, and it kept on heating. Good times.