Do I really need to explain this one that much?
I mean, zombies won’t sleep, so, it won’t be like you can safely stumble around the dark and not potentially bump into one…or a hundred, so, you’ll need something to help you see them. Enter: The flashlight.
Also, a good flashlight can double as solid club if a zombie gets too close. Also also…who doesn’t need to use a flashlight at one point or another?
Seriously, when are you ever going to meet someone who would have no use for a flashlight, or at least, something serving the same purpose?
You can’t…because no such person exists.