How about my dad's thanksgiving pie? When I first got an apartment, I decided I wanted to cook Thanksgiving. My dad was the only one who would come, and he wanted to bring a pie. I had a premonition and bought a back up pie

He decided he wanted to bring a sugar free pie, and put 2/3 cup of sweet-n-low in the pie instead of the equivalent of 2/3 cup of sugar. ICK! Was glad to have the back up pie

When I was little and learning to bake, I put baking soda instead of baking powder in a cake. Double ick.