from curses or pleags , toxic spills ,or voo doo the end is the same the hunger for flesh warm and alive . questing for guts or brains with no fear or remorse. be they the new hyper fast models we will speak of later or the slow lumbering ones from my top choice Night of the living dead (1968) one thing rings true trough out "There coming to get you Barbra". For me this is what should be in a zombie flick you can find it and most of the "of the living dead" family of undeadness here

Chaos descends upon the world as the brains of the recently deceased become inexplicably reanimated, causing the dead to rise and feed on human flesh. Speculation rests on a radiation-covered NASA satellite returning from Venus, but it only remains a speculation. Anyone who dies during the crisis of causes unrelated to brain trauma will return as a flesh-eating zombie, including anyone who has been bitten by a zombie. The only way to destroy the zombies is to destroy the brain.

Most people consider zombies only to be the stuff of horror books and movies, but they do exist in Haiti in the present day.
Thousands of people in Haiti are considered to be zombies, some of which lead normal everyday lives with families, jobs and are respected citizens.
It¹s even considered to be a crime to make a zombie in Haiti.