How is that zombie tracking down its prey? Its hearing and sense of smell have to be just as bad as its eyesight, and since many movies seem to indicate a progression of their decay, it's only going to get worse with time. Eventually, they're just going to be bitey little dried-up sacks of dusty stink that can't do anything, aren't they?
On one level, I understand film's reluctance to include this explanation on camera. After all, how many episodes of 24 included a 10-minute scene of Kiefer Sutherland on the crapper anyway, just pensively staring at his hands, wishing his unreliable insides would cut him some slack so he could go defuse a nuclear president, or whatever it was he did on that show? You try to avoid poop scenes because, in the words of Hitchcock, they're fucking silly. Weren't expecting that, were you? Neither was the cast of Vertigo.
A zombie movie doesn't need to completely devolve into a poop joke to take a moment to account for the simple problem of zombie biology. If they consume flesh, it needs to go somewhere; it's the same deal when I eat Taco Bell. It really is. World War Z made reference to their stomachs exploding, if I recall correctly, but no one on camera has addressed it. At some point, all that tasty man souffle is going to go somewhere, and it's not going to be pleasant. Not at all. Incidentally, I immediately regret the use of "souffle" in that metaphor, as it makes it sound far more sexual than I intended. You'll probably now wonder why I didn't bother to change it.
Why is this question important? Am I a fecalphiliac? Do I have an obsession with butts? This isn't about me, but I will accept butt photos and/or detailed descriptions if you have them handy. It's about a fictional world in which the primary danger to the very existence of humans as a species is a thing that uses eating as its chief weapon. There should be a stunning amount of zombie poop all over the world.