Crystal Coconut
The Crystal Coconut is an item that appears in the Donkey Kong Country cartoon; it was later integrated into the games. On the show, apparently Kaptain Skurvy's great-great-great-grandfather Quin Skurvy stole the Crystal Coconut and hid it in Inka Dinka Doo's eye. However, it popped out and was found by Donkey Kong, making him the future ruler of the Kongo Bongo Island. After that, it was kept in Cranky Kong's house. Often King K. Rool and his assistants Klump and Krusha would try steal it and get its power. Kaptain Skurvy also tried to steal it (with his first and second mates, Kutlass and Green Kroc), claiming that it was his birthright.
So far, Crystal Coconuts have been in two Donkey Kong games. In Donkey Kong 64, Crystal Coconuts were used as power sources for each Kong's special ability. For example, Donkey Kong's Strong Kong ability allowed him to become invincible, but used up Crystal Coconuts. They were semi-common items that could be found in most levels.
Crystal Coconuts also appeared in the game Donkey Kong Barrel Blast. They are a item that come out of red balloons. If the player gets one, they will be invincible and have unlimited Wild Moves.