What is it call when a limp soul sits up?

Answers:
Rigor mortis. Caused by the muscle cell being locked in the contracted position, since it requires ATP (energy) to unlock them back to the relaxed state.
Rigor Mortis, somehow combined with a few stray electrical signals that cause a reflex/muscle contraction.
either that, or Zombie Apocalypse.
Zombie Apocalypse.

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