Oh yeah, that's a mess!
So while dinner was cooking I heard a thud which sounded like Christopher hitting his wall with a baseball, once then again. I was about to yell and fuss at him when I heard a third whump and realized it came from the oven. I opened the door and...
Cleanup. Actually much easier than I expected. We allowed the oven to cool, then vacumed the mess out with a shop vac.