While exploring the school's underground
steam tunnels,
Bart and
Milhouse trigger a massive escape of steam that ruins the school. Although Milhouse is free to go,
Principal Skinner proposes that Bart be sent off to "Upward Bound", a
behavioral modification camp for troublemaking children based in
Portland. Meanwhile,
Moe says he is treating
Homer,
Lenny,
Carl and
Barney with a trip to
Las Vegas, after a
suicide attempt led to him suing the rope company that made a faulty noose and earning a settlement. While the others pack their luggage into a minivan at Moe's, Homer drives Bart to the airport to send him to the camp before going to Vegas. However, Bart is on the
No Fly List after a previous incident. As Bart cannot board a plane, Homer is forced to miss the trip with his friends to drive Bart to the camp. While Bart and Homer are away,
Marge and
Lisa have a yard sale, selling all of Homer and Bart's junk to buy knick-knacks. It is a failure until
Otto discovers that Marge is selling the family's expired prescription drugs. Although reluctant, Marge makes money selling the drugs. Meanwhile, Bart tries to reason with Homer, but he resists. While they stop at a roadside diner, Bart pretends to respect Homer and escapes when he is not paying attention. While driving, Homer discovers Bart trying to hitchhike home but crashes through a guard rail onto a cliff edge. Bart reluctantly rescues Homer by pushing the rear end of the car back onto the ground. They are soon back on the road, now with Bart chained and duct-taped in his seat, because Homer is unable to trust his son. Homer gets Bart to the camp, and leaves him there as Bart sadly watches Homer reluctantly drive away. As he drives to Vegas, Homer begins to feel guilty and decides to retrieve Bart. Although Bart is having a behavioral breakthrough at the camp, he quickly agrees to go with Homer to Vegas. Meanwhile,
Chief Wiggum discovers Marge's scheme and arrests her. Lisa returns home from school and gets two phone messages: one from Marge begging Homer for
bail money and another from Homer who is in prison for fighting with a pit boss and has lost track of Bart. Lisa tells
Maggie that she anticipated this day would happen and states she will look for work in the morning. ==Cultural references==