S5·E11 Nell's Gifted Child

Nel finds out that Joey is a gifted child, and should take a test to see what grade he should be placed into. When Joey tells her that the 4th grade is fine, and that he just wants to play baseball, she insists that he take the test, and gives him several instruments to play to see which one suites him best, the piano being the top. In the end, Joey runs off to the park, and Nell knows he is there when she finds out he wasn't at the school to take the test. She decides to let Joey stay in the 4th grade because a nine year old is supposed to have fun, and not work their tail off.