Corrected entry: On the series 4 DVD box set there is a message from Matt Groening. In the message he is talking about some of the episodes, and refers to "Ralph Wiggum's immortal 'Choo-Choo-Choose Me' valentine to Lisa." In actually, it was a valentine from Lisa to Ralph, and the card read "I Choo-Choo-Choose You."
Scrappy
4th Sep 2004
Correction: The card does say that but Matt Groening is referring to Ralph's first words upon receiving the card which are "You choo choo choose me?"
tw_stuart