Britta is throwing a Halloween pre-party party before the study group goes to the actual party. Abed and Troy show up as the Inspector and the Constable and Jeff shows up as one of those Fast and Furious guys. When he goes to leave, however, Britta stops him and reveals the truth. One hour later, Britta has redone all the tests...and all of them except one reveal that the test taker is mentally disturbed. The group decides not to know which one is the sane one so they can all think it is them and leave for the party. Afterwards, it's revealed the sane test belonged to Abed.