Lots of cultures worry about the dead coming back into something unsavory, whether it's a zombie or vampire. Here's just some of the methods they adhere to:
Bury the corpse face down.
Bury it at a crossroads.
Place a sickle around its neck.
Burn the body.
Putting coins or stones in the mouth.
Cover the grave with a pile of stones.
A brick wedged in the mouth.
Fill the mouth with garlic.
Sever the head.
I'm just trying to picture a funeral director offering packages to be sure your relative is really dead.