After Brennan touches his drum set, Dale tackles him into that and both then get into a rough and tumble fight (played for comedy), including Brennan using the bass drum pedal to hit Dale's head repeatedly. They push, punch and bang each other into walls (causing damage), tumble down the steps, and end up outside. The neighbor's dog gets Brennan by his pant leg, with the two men then struggling on the ground. Dale's dad then arrives and tries to separate them, while Brennan's mom sprays them with a hose (as the two men hold various things to use against each other, including a bicycle). That ends when the two end up hitting each other on the head with a golf club and baseball bat.
Dale jumps up onto the top bed of their makeshift bunk bed, with it then collapsing down onto Brennan. Dale then runs for his dad, yelling about all of the blood, but we then see just a lone bloody scrape/cut on Brennan's arm.
Some bullies (early teen and younger, with a history of bullying Dale) taunt and then beat up him and Brennan. That starts with punching and then kicking Brennan, followed by attacks on both, including having their heads under and being repetitively hit by both sides of a seesaw. One or more then force Brennan's face down toward some dog excrement, making him lick that.
We see an at sea music video that Dale and Brennan made for their song and that includes footage of them accidentally running around against large rocks, destroying the front of Dale's dads boat.
While sleepwalking, Dale and Brennan repeatedly throw Christmas presents and then the Christmas tree into their parent's bedroom. When he's had enough, Dale's dad tries to wake them up, but they then attack, carry and throw him down the steps (played for comedy).
Dale hits Brennan on the head with a drum cymbal, knocking him out. He then thinks Brennan is playing unconscious, and thus punches him hard, but Brennan doesn't react. Panicking, Dale then drags Brennan outside, digs a grave and prepares to bury him. Brennan then shows that he was just faking it and hits Dale on the head with a shovel, followed by completely burying him. Dale then emerges from the dirt and the two fight (played for comedy).
Dale also threatens Brennan to stab his neck with a knife.