I was living at home and my parents got a microwave, so we bought some microwave cake mixes that had just gone on the market. The chocolate one came out looking and feeling like one of those circular grinders that you use to sharpen axe blades! It wouldn't break, even after smashing it on the floor. So we bought a vanilla microwave cake to try again, and got a white grinding wheel as well!

More recently, I tried a baked gnocchi dish and the gnocchi melded together to the bottom of the dish like industrial glue.