Ever since the device was used to change Sarah's parents into geeks, it has had an added affect. It made people, who had been changed, want to change others to become like them. No one knew that the reason it started doing that was because it had been used too many times. It was an error that had been created by overuse.
And now, Sarah and the others were affected by this new malfunctioning device's signal. They had this powerful desire to make others who weren't like them into nudists.
They left the room and began to seek for people to change.