These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Road Of The Dead
Demonic Spiders: The mutant zombies in both games. In the first game, they could not be run over, and could only be killed with the handgun upgrade. The sequel made them somewhat harder to kill, what with being more durable and having potential to interrupt the driving/firing of the driver/passengar. The alpha mutants are even worse, which sums up as being a mutant with the ability to damage your humvee.