Beaver fact: Beavers use tail slaps on water to warn others when danger threatens. Dag abuses this natural alarm, causing Norb to call in their dad to set things right.

Dag winds up in the ultimate bad relationship, smitten by a fishing lure that gets stuck in his tail. Norb responds with tough love, trying to make Dag see that it's better to lose your tail than lose your heart to some fishing tackle that's got its hooks in you.

Getting ready for a party, the boys start comically imitating all their friends who are coming over. They wind up having such a good time by themselves that they forget all about the party and their guests.

The boys learn a lesson in hospitality and manners when they visit Big Rabbit's house and meet his rough and tumble family. Dag digs their crazy lifestyle and goes with the flow, but Norb's sense of civility is sorely tested.

Dag takes Norb's admonition to grow up to the extreme. Acting like his goofy version of a grownup, he drives Norb to distraction and makes him see growing up ain't all it's cracked up to be.

Norb checks the paper and sees a pair of the Mark 5 Model X-Ray Glasses that he must have! So instead of taking money out of his rich bank account, he goes "halves" with Dag and takes all his money! Soon Norb gets the glasses. He puts them on and all he sees is human hand bones. The real X-Ray glasses are invisible, and Dag's wearing them.

When the dam accidentally falls on Norb's head he develops damnesia and forgets who he is. Trying to restore his memory, Dag shows him old home videos. Norb is so shocked by how badly he used to treat his brother that he resolves not to become himself again, but instead become the always nice brother named Troy.