Execution

Source: komplexify.com/epsilon
(The electric chair version)

A priest, a lawyer, and an engineer vacationing in Texas, when (for reasons never made clear to them), they are arrested and sentenced to death by electric chair. The day of the execution come, and the three unlucky men are lead up into the execution chamber.
The priest is strapped in first, and for his last words declares “I believe God will intervene on my behalf!” The guards throw the switch and nothing happens, so they assume God has intervened and let the priest go free.
The lawyer is strapped in next, and for his last words declares “I believe in the power of justice to protect the innocent!” The guards throw the switch and nothing happens, so they assume justice has been served and let the lawyer go free.
Finally, the engineer is strapped in, and for his last words declares “Well shoot! You ain’t gonna electrocute nobody if you don’t plug this dang thing in!”