OCD Zelda
Getting 100% in any Zelda game. Meaning, all heart pieces and containers, various side quest items, item upgrades, etc.
It took me forever to do my OCD Zelda run of Ocarina of Time, but man, do I feel accomplished.
Zelda OCD
When playing any Legend of Zelda game, it is a specific type of obsessive-compulsive disorder in which the sufferer still must collect all common items such as Rupees, Recovery Hearts, Deku Seeds, Arrows, etc. despite already having the maximum carrying capacity of that item.
A typical Zelda OCD sufferer will feel anxious at the sight of a disappearing Green Rupee or Recovery Heart and make a mad run for it like a crackhead.