Man: Bart, think. What happens to you when you turn eight?
Bart: Well, your training wheels come off your bike...
Man: Good. That's good. [plays and sings]
Your training wheels come off your bike,
You start to notice boy you like. Hee hee hee!
Bart: You're just putting that in because it's commercial.
-- Bart's birthday song for Lisa, "Stark Raving Dad"