children shouldn't play with dead things (1973)

aka Cemetery of the Dead. Things from the Dead. Zombie Graveyard.
"You should have stuck to the clown act."
A couple of actors play a prank on some friends, pretending to dig up a corpse and perform a satanic ritual to resurrect the dead. Unfortunately for everyone their spells work!
Would be comedy that is far to talky for its own good, taking far too long to get to the chomping.