As a kid, one time, my sister made homemade chocolate chip cookies. She found the flour wrapped in a plastic ziploc bag in the pantry. She baked the cookies and they came out very thin and flat. She and her friends ate them anyways. They all had digestive upset. When my mom found out she said that we were out of flour. Where did you get the flour?
It turns out that she made the cookies with wallpaper paste.