In "Nick and Nora's Infinite Playlist" the irony is that Jay Baruchel is the cool, hip ex-boyfriend of the chick Cera ends up with.
Eisenberg played a very hardcore Zuckerberg, Cera has only left his nerd roots once and even then he was still a nerd until he was forced to fight others as Scott Pilgrim.
Seeing what he goes thru being in love with his cousin on "Arrested Developement" still makes me laugh to this day!
DJ Qualls gets honorable mention based on name alone, hell I saw his name in the credits for two or three movies before I associated him with the name because that name is sooo far from his face it's ridiculous!!!