Board Thread:Anything Goes/@comment-26503939-20160801132531/@comment-26955166-20160801133732

I see multiples:

Grass because it is only obtainable via Creative or Enchants, and it is not part of any crafting recepies

Wood Log because it grows on trees

Wool Block because it is dropped by Sheep, either by Shears or by killing them

Obsidian for two reasons: It is required to build a Nether Portal, AND it requires a Diamond Pickaxe to obtain

Ender Dragon, The Wither, Polar Bear

See if you can find reasons for all 3 being the Odd one Out