This line is reminiscent to a scene from the movie [http://www.imdb.com/title/tt0101587/ City Slickers], and is an old gag used in countless other movies and TV shows. It is a running joke on the crime procedural [http://en.wikipedia.org/wiki/NCIS_%28TV_series%29 NCIS], where the charter of Gibbs often approaches without warning while other characters are talking about him. In [http://en.wikipedia.org/wiki/Pantomime Pantomime] audience participation often takes the form of calling out "He's Behind behind you!"
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The cashier that gets infected by [[Pestilence]] in the closing scene [[5.19 Hammer Of The of the Gods]] appears in the ER room in [[5.20 The Devil You Know]].