I forgot I had stashed some plastic food containers in the oven, and then I turned the oven on and...
now there's melted plastic all over the oven.
Kerr hears this sad tale all the time. But if you do make this gaffe (and feel a little silly about it), heat the oven to a very low temperature—200 degrees is the lowest most ovens go—so the plastic is pliable, and then scrape it off. (You can also use ice to freeze it, but this is trickier because the ice will start to melt, plus you'll have to disconnect the gas from the stove first.)
Next: The 9 most disgusting places in your home