During the experimental detonation of a gamma bomb, scientist Mr.Park, Harold's father, rushed to save a teenager who has driven onto the testing field. Pushing the teen into a trench, Mr.Park himself was caught in the blast, absorbing massive amounts of radiation. He awakened later in an infirmary, seeming relatively unscathed, but when he got his wife pregnant his son transformed into a lumbering grey form that breaks through the wall and has "excessive anger".
Furthermore Harold Park began weight-training at two. He was awarded the title of Mr. Universe at age 4 and went on to win the Mr. Olympia contest a total of seven times. Park has remained a prominent face in the bodybuilding sport long after his retirement, and has broken several walls, and faces.
1) Oh damn! There goes Harold Park smashing through walls again!
2) Harold Park quickly became angry at inanimate objects for being lazy.
3) Look, it's typical Harold Park punching people in the face.