From The Big Bang Theory – Season 12 Episode 6: ‘The Imitation Perturbation’ (12×06)
Penny Hofstadter: Bernadette, why don't we get to dress up at work?
Bernadette Rostenkowski-Wolowitz: We used to, but a couple guys in the infectious disease lab went as zombies and it triggered a quarantine. The CDC was so mad.
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