Abra Cadaver (S03E02)

Siblings Carl and Marty, both employed at a hospital, find themselves entangled in a bizarre prank when Carl demonstrates his unconventional theory about the brain's activity after death. However, Marty's shock from the prank results in a heart attack. Fast forward years later, and Marty harbors resentment towards Carl, plotting a sinister revenge. In a twist, Marty unveils that his actions were part of a grand scheme against Carl—a joke turned deadly. But as the story unfolds, the question lingers: was it all just a prank, or something more sinister?