It's Not Coal

Ack!, So I broke my three year streak and burnt $100 worth of goods in the oven the other day. The things were smoking so they had to be released on the patio while I aired the toxic fumes out of the house.

By the time I was ready to bring them back in i had to do a little hunting. They were covered in about a foot of snow but underneath they looked like the same, pissed off, burnt, puffy, little evil coals... minus the smoke. On the tray are two Peanut Butter and Jelly sets and one I Heart Brains BFF set (could have been much worse)

At first I thought I just pressed broil instead of bake on the digital oven but upon closer investigation I found out something a little different. My question now is...

why in the eff would someone change their oven from fahrenheit to celsius before leaving on a trip without telling their clay cooking daughter who happens to be watching their house while they're goooone?!?!  
I'm now on day 3 of my new not burning anything streak