"Paradigms of Human Memory" is the 21st episode of the second season of Community. It was originally broadcast on April 21, 2011 on NBC.Though it contained almost no material from previous episodes, the episode had the format of a clip show, parodying the genre and self-parodying many aspects of the show itself as the characters took a memory lane down the school year. In it, they point out each member's transgressions in the past year that have affected the group's stability.