Three people are scheduled for execution: a priest, an attorney, and an engineer.
First, the priest steps up to the gallows. The executioner pulls the lever to drop the hatch, but nothing happens. The priest claims divine intervention and demands his release, so he is set free.
Next, the attorney takes a stand at the gallows. The executioner pulls the lever, but again nothing happens. The attorney claims another attempt would be double jeopardy and demands release, so he is set free.
Finally, the engineer steps up to the gallows, and begins a careful examination of the scaffold. Before the executioner can pull the lever, he looks up and declares, “Aha, here’s your problem.”
Via: Coding Horror