Pascal's Triangle Revisited

S1, E25: It's the last day of the semester, and the gang attends the annual "Transfer Formal." Jeff (Joel McHale) is caught between Britta (Gillian Jacobs) and Professor Slater (Lauren Stamile). Meanwhile, Annie (Alison Brie) questions her relationship with Vaughn (Eric Christian Olsen), and Abed (Danny Pudi) and Troy's (Donald Glover) friendship is put to the test.