Step 1. Make a serious mess with gravy in the oven at dinner.
Step 2. Ignore said mess and go to bed
Step 3. Decide to bake the next day, suddenly realizing smoking gravy will not make pumpkin taste good.
Step 4. Set the oven to self clean, without attempting to remove any of aforementioned gravy.
Step 5. Watch enormous flames wick from the gravy while you attempt to unlock the self-cleaning oven.