The line comes from Anchorman: The Legend of Ron Burgundy, the 2004 comedy set around a 1970s San Diego television news team led by Ron Burgundy. The film became a lasting source of quoted reaction lines, and short clips were later shared widely on meme pages and soundboards. This moment survives because the panic fits many situations beyond the movie, from gaming ambushes to unexpected arrivals at home. Its theatrical delivery keeps it recognisable even when viewers have not seen the full scene.
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Panicked Anchorman clip of a man shouting they're coming in through the back door, used for surprise attacks, raids and chaotic entrances in edits.
This is a frantic movie line delivered at full panic, with a man's voice rising as he realises attackers are entering from behind. The shout of oh no, they're coming in through the back door, builds quickly over about seventeen seconds of commotion and alarm. It sounds urgent on the surface, but the over the top delivery makes it funny rather than frightening. Placed over an ordinary moment, it instantly turns a small interruption into a full scale invasion, which is why viewers read it as exaggerated dread and comic chaos.