I avoid most games known for being hard, so generally complete everything. This means the stuff I give up on really annoys me. The boss on the 4th mansion in Luigi's Mansion. The one where you're falling down a hole, and below you the boss is a spinning face... covered by loads of armour pieces, that you have to use gyro controls to aim bombs at, destroy them all, then lob a final one in his mouth. I've always hated gyro controls anyway, but I disliked that fight so much I gave up on the game.