Paper Mario: The Thousand-Year Door Glitches

Make Flower Fuzzies suck hp instead of fp!
Make sure you fight a Flower Fuzzie and have Koops leveled up. Have Koops use shell shield on Mario. Wait until the Flower Fuzzie attacks. Did you notice he didn't take hp and not fp? Want to know why? No? I'll tell you anyways. It's because the shell shield doesn't have any fp with it so it loses the hp it has! Cool right?