Youth in Revolt.
All the reviews I've read claim that the movie is a severe acting departure from Michael Cera's previous movies where he constantly plays the very same stereotypical awkward, soft-spoken, angsty teen roles.
It wasn't. While the split personality gig was a tad refreshing, it was practically the same character with expletives thrown into the script. Some points of the movie were slightly entertaining, but over-all, it was more of the same.