He is near-genius (with an IQ of 155), a Mensa member, a graduate of the Johns Hopkins School of Medicine, and a former stripper. Hibbert is noticeably less dysfunctional than just about everyone else on the show, though he does have a bizarre tendency to chuckle at inappropriate moments which is later revealed to be a coping mechanism. In "Make Room for Lisa", Hibbert tells Lisa that "Before I learned to chuckle mindlessly, I was headed to an early grave." He reacts questionably to certain medical problems. For example, when Maggie saved Homer from drowning, he attributed it to common cases of superhuman strength in children whose parents' lives are in danger. Likewise, he expressed only mild surprise when both of Abraham Simpson's kidneys were revealed to have exploded. In a "Treehouse of Horror" episode, Dr. Hibbert discusses the possibility of Bart being a "genetic chosen one" who can cure a zombie apocalypse over the phone with the Simpsons while under siege from the aforementioned zombies. Though he manages to dispatch several with various medical equipment (taking down a nurse with an expertly-thrown syringe to the forehead), he is eventually overwhelmed and bitten after requesting that the Simpsons tell his wife that he loves her if they should encounter her.