How to [nearly] burn the house down or cause some serious smoke damage.
Get a new black toaster oven for Christmas as the old white one was looking drab and also never worked properly.
Notice an odd burning smell every time you use the toaster oven. Initially think something plastic has fallen down into the bowels of the dishwasher and is melting but when you cannot find anything, blow it off as that “new toaster oven is getting broken in” smell.
Feel like an idiot when your husband notices the smell one night when making the 3-year-old cheese toast and immediately pulls a thin strip of packing cardboard out.