Principal Skinner teaches his students about fire prevention. However, Bart makes a very big wave that floods the school's gym and schoolyard. Skinner is very angry at Bart. Skinner tells Homer and Marge that Bart has been diagnosed with ADHD. Bart must take the drug Focusyn (a parody of Ritalin). Marge is worried because Focusyn is a new drug and it might not be safe. 