Fans of the Legend of Zelda series know all too well that one must look before one poops.
"???" is a recurring character who unpleasantly pops up in three Zelda games. Seriously — its hand literally pops up from a toilet. We're first introduced to this stinky hand in Majora's Mask, in a Stock Pot Inn toilet in the game's hub town of Clock Town. He — let's just assume it's a "he," shall we — makes his smelly presence known between midnight and 6am, asking for … paper. (What else?) If the player gives him an item made of paper, such as the Title Deeds, Letter to Kafei, or Special Delivery to Mama, they're rewarded with a piece of heart. Good deal! (Just make sure to wash it first.)
Our stinky hand-friend pops up again in the Game Boy Color title Oracle of Ages. This time, ??? asks for — you guessed it — paper. Sparing a square (of Stationary) rewards the player with the appropriately named "Stink Bag." We sympathize with Link for having to carry around — well — a bag of stink, at least until the next trade.
The last time we see ??? — at least, for now — is in Skyward Sword. Found in a Knight Academy toilet, it asks for … *sigh* … paper. If Link hooks the hand up with Cawlin's letter, the player is rewarded with five — count 'em, five — Gratitude Crystals. (That's one thankful toilet dweller!) After this exchange, the yucky extremity can be found caressing Cawlin's head while he sleeps. Hopefully Cawlin uses anti-fungal shampoo.