In this example of poor user experience design, the government has designed two identical buttons: one launches all of the country's nukes, and the other makes coffee. The takeaway is that the look of a feature should match its importance and urgency. A button that launches the nukes should probably be small, round, and not very easy to access, whereas a button to make coffee could be larger and in a more accessible place.
Larry learns that Mrs. Tainot is playing music to drown out the GPS voice, which never stops. He then helps her turn off the "auto-on" feature on the very complicated GPS, which has no shortage of menus, submenus, and confirmation prompts.