Oh Brother Where Art Thou / The Wall.Oh Brother Where Art Thou: When Simon goes missing and nobody seems to remember who he is, Alvin worries that he is losing his mind.
The Wall: The wall in the girl's bathroom has pictures of the Chipmunks, with votes as to who among them is the cutest. Alvin becomes obsessed with this, wanting desperately to be seen as the cutest of them all, wanting his brothers to make themselves seem less cute and appealing, though neither of them care about their rankings. His attempts to make his brothers look like fools causes them to actually rise in the rankings, and Alvin to drop, so he tries to act more nerdy like Simon and more babyish like Theodore, which still does not help him. After a special meeting with other girls in school - which Alvin attends, disguising himself as one "Chantral Beauregard" - the girls agree to vote Alvin the cutest and be nice to him about it (after Brittany bribed them into doing it).