#2 He pushed an amputee down the stairs and destroyed him on SmackDown
Brock Lesnar aligned himself with the evil boss Mr. McMahon. Lesnar has done a lot of crazy things in the past, but this was as heinous as it sounds. That's most likely why WWE wants you to forget about it. WWE brought in an amputee named Zach Gowen. He was another victim for The Beast to annihilate.
On an episode of Smackdown in 2003, Lesnar tormented Gowen. He had the one-legged man in a wheelchair with a brace in place of his missing right leg and even covered up his mouth. After Lesnar told Vince that he's the one responsible for the monster he turned into, things escalated further after that.
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Lesnar took Gowen over the stairwell and told him that the wheelchair had magic because it could fly. Lesnar choked Gowen out and then he shoved him down the stairs. If that wasn't horrible enough, the following week on SmackDown, he faced Gowen in a match and brutalized him in front of his family. Things got worse as Lesnar went on to bust Gowen open leaving him with blood all over his face.