Tawny, Twitty and Tom wait for Louis, who they are supposed to meet in the gym. To their great surprise, they find out that he's a member of the school's diving team! But when Louis does his first dive in competition, it's a ragged cannonball that splashes about half the water out of the pool, to the crowd's great amusement. Meanwhile, Ruby has the early word on who is going to win in the class favorites voting. Ren is set to sweep the big awards, but when she hears that another girl, Kelly, is ahead in the "Best Smile" voting, it brings out her competitive nature and she determines to win that award too.
When Louis comes home late, he doesn't want to tell his parents where he's been, but Ren spills the beans about him being on the diving team. Steve and Eileen are delighted at this news. Ren works on her smile that night and the next day at school she and Kelly are involved in a big "smile-down." At Louis' next diving meet, his dad brings along his boss Mr. Kupchek to see his son. But Louis does his same big-splash dive, which the crowd thinks is funny, but which drenches Kupchek and probably end's Steve's chance of a promotion. Later at home Steve tells Louis how proud he was of him for making the team, but how disappointed that he didn't take it seriously. He tells his son that everything in life can't be a joke all the time. Louis takes what his dad says to heart and imagines himself at his 10-year junior high reunion, still acting like the class clown, only now he's just an embarrassment to his former friends.
At school, Kelly tells Ren that she's tired of the competition and is through with it. There's a big problem, though: Ren's facial muscles have locked into a smile and she can't get it off her face! Ruby puts heavy makeup on Ren and gives her a new hairstyle to distract from the constant smiling. Ren is supposed to sing the school song before the diving match and she cuts through the steam room to get there. When she emerges before the crowd at the match, her makeup is smeared and her hair is standing on end, making her, not Louis, look like the clown. Louis, for his part, takes his diving seriously this time and does it straight. This disappoints the crowd, but his dad, who has unexpectedly shown up to support his son, is proud of Louis, even though he accidentally lost his trunks during the dive!