I got the munchies back in college and figured I had everything I needed to make oatmeal cookies. I couldn't find the flour, but after some digging I found a tuperware tub of flour in a storage closet behind the kitchen. The cookie dough didn't taste quite right as I was mixing it up but I kept going. After a few minutes I couldn't even stir it. Yup, my flour was really plaster of paris