Brucey

Brucey is a bodybuilding brony who confronted Mike and forced him into a challenge: If Mike wins a weight lifting contest, he can get 1000 dollars but if Brucey wins, Mike will be forced into being a brony and Mikes fanbase and friends will now belong to Brucey.

Mike casually took up the challenge and ended up winning because Brucey couldn't pick up the weights with the hooves on his hands. This made Brucey swear revenge that he will get Mike and friends one day for being humiliated.