Mario Head (also known as Mario's Ugly Head or The Giant Floating Mario Head) is the head version of Mario. He is from Mario Teaches Typing and Mario Teaches Typing 2.
He first appeared in Ssenmodnar 8 (150k special), where he got attracted to the Golden Spaghetti, and sucked everything and everyone inside when Mario refused to hand over the Spaghetti. The skits also take place inside him; however, it was revealed to be all just a dream Mario had while inside Mario Head. Then Toad tells him that he accidentally pooped inside him when he was eaten, causing Mario Head to expel and for everything and everyone inside to fly out of his mouth. Mario then throws a bomb into his mouth, causing Mario's ugly head to explode after eating it, killing him.
In SM64: The Retardness of 2014, Mario starts eating another golden spaghetti. Much to their horror, a specter/ghostly version of Mario Head appears, asking them if they have seen the princess. As Mario Head calls for the Princess, SMG4 and Mario run away screaming.
In Ssenmodnar 10, he was summoned by Toad to crash into the Mushroom Kingdom (in a style markedly similar to how Skull Kid tried to destroy Termina in The Legend of Zelda: Majora's Mask). However, he was ultimately stopped by Mario with a Mega Mushroom (though he changed course after Mario replied he saved the world).
A still version of him can be found in Ssenmodnar 0 at the end of the blooper after the whole world becomes retarded.
In SM64: Retarded Recap 2015 the scene of him crashing into the mushroom kingdom is shown again. But this time Mario appears on top of him and shoved a rocket into him to speed him up because it was taking too long.
Mario Head has a major role in SM64: Mario learns to type, where while Mario is using either Mario Teaches Typing or Mario Teaches Typing 2 while learning how to type, the Mario Head teaches him through the typing process. This marks his newest major role in a blooper since Ssenmodnar 10.