After a classroom smackdown with a group of « mean girls » led by Meghan, Britta, Shirley, and Annie bond with Abed by turning him into the ultimate « mean girl. » Meanwhile, Jeff and Troy embrace a zen-like spirituality under the guidance of a groundskeeper when they come across a secret trampoline on campus. Determined to uncover the source of their new bliss, Pierce ends up taking a disastrous turn on the trampoline and lands in the hospital.