Punch-Out!!: Aran Ryan Got His Hands On Soda Popinski's Soda
So, let's say Aran was a gigantic fan boy of Soda Popinski. So much so that he got into his dressing room and stole some of his soda. So, he drank a few bottles of the steroid laced soda, and basically went crazy. He decided on the spot that he wanted to be a boxer like his idol, Popinski, so he picked up a pair of boxing gloves and, crazed by much more soda than his body could take, pretty much destroyed the boxers leading up to him. It would explain why he's so jittery and eccentric.
Hell, he's probably not even Irish! It's just how he hears himself in his mind!