Footage from an Indonesian burial service is no doubt bringing nerves higher after a scary moment in which a corpse appeared to "wave" through the window of its coffin.

The moment was captured on video while mourners looked on.

Corpse Waves To Mourners Through Coffins Glass Panel www.youtube.com

"God has said in the Book of John, 'I am the resurrection and the life. Whoever believes in me, he will live even though he is dead.'"

The priest's words seemed prophetic as the deceased person's hand then hit the front window of the coffin and disappeared from sight.

While several people were afraid this pointed to a live burial, still others told their own ghost stories of the purportedly dead coming back to life for moments.

Then of course was the big question—what sort of coffins have windows?

Rigor mortis, from the latin words meaning "stiffness of death," refers to the stiffening and shifting of the joints and muscles in the body after death.

Rigor mortis could easily have been responsible for a corpse moving after death. The phenomenon is reported regularly at morgues and mortuaries.

But it is still creepy.

While the likelihood that rigor mortis is responsible is high, it doesn't rule out the living dead.

Would anyone be surprised by a zombie outbreak right now?

The book Beyond the Dark Veil: Post Mortem & Mourning Photography from The Thanatos Archive is available here.