Community - Season 2 Episode 21 -

As the study group gathers to assemble their 20th and final Anthropology diorama of the year, they begin reminiscing about their favorite times together - including a trip they made to a western ghost town, a last minute glee club performance and the array of costumes that Dean Pelton has managed to wear over the year. Meanwhile, Troy's pet monkey returns, only to disappear back into the school's ventilation system.