How to Kill a Human Being
In this BBC documentary How to Kill a Human Being, a researcher explains and demonstrate the long drop hanging, a method used in Commonwealth countries, following the old British system left over after colonial rule.
By using a crude calculation of weight of prisoner to length of rope, this method of hanging sometimes gruesomely decapitates the head if the drop is too long or if the neck is too weak to withstand the impact of the drop.
Barzan Ibrahim, Saddam Hussein's half brother, was decapitated this way in 2007 following a botched execution.
Worse, there have been cases where the drop was not sufficient to put out the condemned immediately and he remains struggling until eventually suffocating due to the tightening of the cord around the neck.
Countries like Egypt, Kuwait, Singapore and Malaysia adpt this method of hanging, arguably a humane form of execution as the condemned may feel pain of a very short duration or immediate unconsciousness. But it is still not fool proof nor 100% as some cases show.