Bottom oven rack had been NUKED!

This is far to simple to even be a worthy story ,other than that the cause is a bit interesting. My wife had placed a plastic cutting board and some meat into the oven to get it away from my counter-cruising dog.
Later, without remembering the cutting board she turned the oven on to "broil." Hmmmm...

REPAIR:
Open oven door
Put in new rack
Close door