The office lunch thief is one of the most detested figures in the workplace. They strike without warning and often leave nothing but a half-eaten sandwich or empty Tupperware container. These employees are taking a stand and letting office lunch thieves know that their bad behavior will not be tolerated. Also, they've spit in the salad dressing to teach the punks a lesson. 

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Source: epicweird
 

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Source: popfi

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Source: uberhumor