In Super Mario Bros. 2, due to a code idiosyncrasy, the keys actually have a HP value (15). When hit…

In Super Mario Bros. 2, due to a code idiosyncrasy, the keys actually have a HP value (15). When hit 15 times by another item (a Mushroom Block in the footage), the key will flash and make a "boss getting hurt" sound. This works in the original NES and Super Mario All-Stars versions, but was fixed in Super Mario Advance. Unfortunately, there are no further effects to this. While it may appear upon…