When trying to enroll her children into the Right Choice Ranch for troubled youth, Joy is denied enrollment because of a barn burning incident at the hands of a younger Earl. Earl, Randy and Catalina travel to the camp to make amends for the barn burning by building a pen for the camp's ostrich. Earl learns the real reason behind the barn burning incident and decides that every incident on his list after the fire should be shared by Randy.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
Earl goes back to the Camp for Troubled Boys to make up for #164 "Burned down a barn at camp" that got him and his relatives banned from the camp, so that Joy's kids can go. After building an ostrich pen to make up for it, Earl finds out that it was actually Randy who burnt down the barn. This means that Randy is responsible for all of Earl's bad doings after that point, and Earl happily hands over half of the responsibility for the list to him.