When Paddy Murphy came to the states, he looked in the classifieds for a job. The only one he saw was for a forest ranger. Although he knew nothing about it he decided he would apply for the job.

The boss asked a few questions and then took him to a large oak tree. "Now Paddy, can you identify the back of the tree.

Paddy looked it up and down, walked all around it, and then pointed " That's the back"

The boss said" and how did you determined that"

Paddy said " Because someone took a sh.t behind it"