This document summarizes several unhelpful or evil items from Nintendo games:
1. An evil chu jelly in Zelda that damages health instead of restoring it and an evil mushroom with a skull that removes power-ups or kills Mario.
2. The dreaded blue shell in Mario Kart that hits the player in first place right before they finish, allowing others to pass them.
3. A mushroom in Mario that shrinks the player down to mushroom size but kills them if hit, providing little help.
4. Other unhelpful items include a Zelda potion with limited underwater time compared to suits, a Kirby sleep ability, and useless Mr. Saturn and Jig