Because Yin tends to brag every time she "smoked" him in tests, quizzes, and other things marked on their Woo Foo report cards, Yang had a plan to beat her in their next history quiz: first, he continues "screwing around" (as his own sister puts it) in ways that distract Yin's attempts to study, and then he puts on the Glasses of Ultimate Smartness so he won't have to study... Yin points out that it's cheating, but does nothing to stop him. By the time the quiz starts (in the form of a Game Show), Yang is so smart that he could answer most (if not all) of the questions before Bird, in place of Yo, could finish asking them, giving Yin a taste of her own medicine and convincing Yang that he should never take the glasses off... ever.