Another time, I was probably 18 or 19, I had a recipe for a Rocky Road Cake. It used brownie mix with lots of other stuff. It smelled so good. But, we had to use a VERY sharp knife and saw it. Impossible to chew. A friend really liked it so he took it home. My dad finally figured out that the brownie mix was really old and expired. My dad was a baker so he knew such things.