Sp00n in his notorious horse mask.
The Horse Mask (or just Horse's in general) is a very popular running gag/meme in the Creature Universe.
History
The Horse Mask became a common theme with the creatures when Sp00n first made a vlog in his horse mask (due to not wanting to reveal his face.) Since then whenever a horse is seen or mentioned the creatures will go "There's Sp00n" After Sp00n revealed his face at The Creature Panel at RTX 2013, the horse mask still was used, as Aleks wore a horse mask (possibly Sp00n's) to go see Wolverine.
Trivia
- During his playthrough of Saints Row IV with Nova, Sp00n's character wore a horse mask.