What's your worst flop that you made?

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The worst flops in my family were usually due to no labels. We lived where the mice ate through everything and there were so many field mice the cats couldn't even keep up. So my Mother put everthing from a box into large glass jars. One time, my Dad, who usually made the best pancakes, couldn't get his pancakes to thicken. He tried them. Super-sweet scrambled eggs. He had mistaken the powdered sugar for flour. My salt-instead-0f-granular-sugar cookies were pretty awful, too. Since then, we've found labels that even stick in high humidity. What flops have you had any why?