This is one of the most ridiculous and unrealistic Newsradio episodes, and it's also one of the funniest.
In this episode, Joe makes an experimental "smart drink" in the break room and gives it to Matthew. Matthew becomes smarter and smarter until he becomes "Smatthew". He reads four books at a time and talks to Dave about the Nixon administration through Star Wars metaphors. Eventually, Smatthew becomes so smart that he realizes Joe's smart drink is just a placebo, and he becomes regular Matthew again.