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Season 3, episode 17
While Michael is having a meltdown in front of Ryan's business-school class, the rest of the staff has to deal with a bat loose in the office, after which Jim convinces Dwight that he may be turning into a vampire. John Krasinski underplays the prank just enough to make it convincing. Knowing "Buffy the Vampire Slayer" creator Joss Whedon directed the episode makes it that much more fun.