Put two loafs of bread right in the oven, and boom - black as soot when the timer beeped. I didn't know what was wrong - at least, not until I confronted my mad scientist-esque wife, who removed her goggles as I walked into her lab.
"I was experimenting with the measures of convection on the oven to see how hot it could get without blowing up the house," she said. "Why? Did I forget to revert it to its original settings?"