Toad, an Anti-Koopa singer, ended up being sentenced to become a Goomba in this manner after he was arrested for singing Anti-Koopa songs. It is also implied that this was the fate of anyone within Dinohattan who committed crimes short of de-evolution of Primordial Slime. Koopa himself nearly ended up becoming a Goomba when the Mario Bros. revolted from the prison and escaped, although the process ended prematurely, not exposing him to enough radiation to ensure that he became a Goomba.