The Simpsons pull up to a sci-fy convention and Homer screams "nerd" at a nerd. He then proceeds to explain his life philosophy to Marge. They enter the convention and Homer finds himself overwhelmed with rage. He goes on a punching spree. The next day we find Bart at the doctor's. After some tests, Bart is transformed into a nerd. Homer returns home from work and finds his son has turned into the thing he hates most, and he is heartbroken. He does what he has to do. He sneaks into Bart's bedroom at night and smoothers him with a pillow.