Have you ever said something bad or joking about someone only to realize that they were right behind you when you said it? Don't worry! You are not alone, as can be seen by this great supercut video of characters saying, "He's right behind me, isn't he?"
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Source: Vulture (http://www.vulture.com/2012/11/supercut-of-hes-right-behind-me-isnt-he.html)