[The episode starts with Lisa working on her new invention, which looks seemingly like a futuristic flashlight.]
Lisa: At last! My newest invention is complete! Just hope that nothing bad happens with this one.
[Cut to flashbacks of "Pains in the Neck", "Dimension Hoppers", and "Loud's Day Out". Cut back to the present, where a boomerang lands onto Lisa's desk.]
Lisa: [picks up the boomerang] What in the name of Pythagoras of this?
Lynn: Hey, Lis! I need my boomerang back. [takes the boomerang] A-thank you. [about to leave]
Lisa: The next time you throw that, do it away from my place of study.
Lynn: Pfft! Whatever. [notices Lisa's new invention] Cool! What's this? [grabs the invention and starts pushing random buttons]
Lisa: [tries to get it back from Lynn, who's raising it higher than she can reach] Lynn! Knock this juvenile behavior off at once! That's a very sensitive-
[Lynn stops pushing the buttons on it when the lamp inside the flashlight-esque device starts changing colors.]
Lynn: Looks like you made one of those disco lights. Which, FYI, were already invented.
Lisa: No, I didn't. I made a-
Lynn: [interrupts] Stop trying to cover up your lack of origina-
[The device starts shaking in Lynn's hands. It then releases several laser beams, which ricochet off of one of the family potraits in the hallway, the TV downstairs, and the many mirrors Lola has around her to practice for her next pageant. They blow up the front of Mr. Grouse's house, specifically his bathroom while he's taking a bath.]
Mr. Grouse: [as his bathtub steadily tilts off the bathroom floor] No, no, no, no, no. NOOOOOO!
[Mr. Grouse's bathtub slides off the bathroom floor and breaks, while he's sitting on his front.]
Mr. Grouse: [to the Loud House] You're paying for the damages, Louds!
[Cut to most of the sisters, sans Lynn and Lisa, Lincoln, and Sam looking through the window at Mr. Grouse. Shortly after, all the sisters glare at the two boys, thinking they caused the damages.]
Sam (OC): I'd just like to point out that this is neither of our faults.
Lincoln: Considering that, who could've done this?
[Cut to Lynn and Lisa, with the flashlight, tiptoeing across the hallway towards the bathroom, until the others glare at them from downstairs.]
Lori: We know you were up to this, Lisa.
Lynn: [to Lisa] We're totally busted...
Lisa: You mean you're busted. [to the others] It was Lynn's fault.
Lynn: [bitterly] Snitch... [to herself] Well... Not as much as Lola.
[Cut to Lynn carefully trimming Mr. Grouse's bushes and various other tasks to pay him back.]
Mr. Grouse: I want the fences painted gray next, Loud. And when you're done, go and fix the hole in what used to be my bathroom.
[Lynn groans, and grabs a gray paint bucket as well as putting on a painter outfit.]
THE END