Ralph visits Double Dan to get a virus that will allow him to slow down the Slaughter Race game. Double Dan shows him Arthur, a virus, and explains how Arthur works: he looks for defects in the programming and spreads it throughout the game.
Beakman explains that a video game is a version of a computer. He goes over all of the computer components and then to show how this all works, they do a skit. In the skit, they have to give the exact program code to Lester (aka computer) to be able to do the action they want.
A medical student treats patients, illegally, using humor and gets accosted by his peer who reminds him the seriousness of his occupation. His roommate encourages him to the situation from another perspective- as a patient- would he really want to be treated by a doctor who barely skimmed his textbooks? The root of this discussion comes from the roommate's pressure from himself and his family to become the best doctor possible.