When Shaquille O'Neal was 11, he was so abnormally large that he had to bring his birth certificate when trick-or-treating. Never mind the phenomenal talent that would be evident young and that has carried him to four NBA championships and a stratospheric career. For years, he felt like an outsider and was treated like a freak. O'Neal rarely touches on that personal history in his new ABC reality show, "Shaq's Big Challenge," but it's hard to believe that it didn't influence his choice of subject: the epidemic that is childhood obesity.