Ocarina of Time: Skull Kid
In Ocarina of Time, a Skull Kid can be found in the Lost Woods, in the area directly to the left of the entrance room. Whenever Link approaches, the Skull Kid will disappear from the area. To circumvent this, Link can befriend the Skull Kid by playing Saria’s Song while standing on top of the stump across from the Skull Kid’s position, and he will receive a Piece of Heart as a gift. Another two Skull Kids can be found in the area directly to the right of the entrance, where there is a mini-game in which Link repeats a sequence of notes on his ocarina to win a Piece of Heart.