In the movie, when Dianne runs out of the Winchester she is calling her boyfriend's name. Because we just saw him torn to pieces by the zombies (and because Dianne is beating zombies with his severed leg) it's reasonable to assume that she can't save him and is instead making an insane rush against his killers, soon to meet her own similarly gruesome fate.
Instead of simply illustrating Dianne's grisly fate, this one completely changes what we would otherwise expect, going in a totally different direction that amazingly makes perfect sense (or as much sense as can be made in your typical zombie movie), while at the same time maintaining the same tongue-in-cheek tone of the rest of the movie. It's narrated by Dianne, of course, and has a characteristically classic joke at the end.
Instead of simply illustrating Dianne's grisly fate, this one completely changes what we would otherwise expect, going in a totally different direction that amazingly makes perfect sense (or as much sense as can be made in your typical zombie movie), while at the same time maintaining the same tongue-in-cheek tone of the rest of the movie. It's narrated by Dianne, of course, and has a characteristically classic joke at the end.