Controversial Wild West icon John Wesley Hardin took teenage rebellion to the extreme. Born into a family of Methodist preachers, John gave the Holy Spirit the middle finger and dove headfirst into a life of crime.

While most kids were stressing over homework, John had already notched his first kill. By 23, his murder spree caught up with him, landing him a 24-year prison sentence. The official body count stood at 27, but John bragged about offing over 42 men. One poor sap bit the dust for snoring too loudly - John's solution? Shoot through the wall to "wake him up."

Fresh out of the slammer in 1894, Hardin's freedom tour was cut short. Within a year, he got a taste of his own medicine, courtesy of John Selman in an El Paso saloon.