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The goofy Yellow Apple.
A Yellow Apple is an item in Super Paper Mario. Found on a tree a tree in Overthere Stair, it restores 5 HP and cures poison. Mario and Co. thought this might have been the taboo fruit to wake up Princess Peach. They fed one to her, and she woke up at once, wondering what was going on. Then, the true effect of the apple activated, causing Peach to grow a moustache! The effect wore off immediately, and Peach went back to sleep, as if nothing happened.