Oh, also.... "I Hung My Head" by Johnny Cash
"Early one mornin' with time to kill
I borrowed Jeb's rifle and sat on the hill
I saw a lone rider, crossin' the plain
I drew a bead on him to practice my aim
My brother's rifle went off in my hand
The shot rang out, across the land
The horse he kept runnin', the rider was dead
I hung my head, I hung my head"
Always reminds me of the four rules.