Everything belongs to their respective owners.
(The Simpson's House, Backyard)
Bart finished filling a balloon with water, tying it up and walking to a metallic slingshot while Lisa, looking quite annoyed, walked to him. "Okay, Bart, I'm here," said Lisa as the boy grabbed the slingshot, "What's so important that you had to call me while I was playing with Rockball?"
"I called you because I wanted you to be the first to see the brand new omni slingshot's power!" stated Bart, who showed the mentioned slingshot to his sister. Before he pointed at a piece of paper laying around, "See that paper over there in case you wonder what it does."
Lisa sighed and walked to the paper, grabbing it and reading it as Bart got prepared to shoot the water balloon with his slingshot.
"It says here that the slingshot is specifically build so it can shoot objects with enough power to send them practically anywhere, regardless of the user's strength," read Lisa with a slightly irritated tone, "So, quit stalling and do it already."
Bart threw the water balloon and it went up...and up...and up...until it eventually vanished from view, with a twinkle in the sky appearing where it could be originally seen. "Well, whether the balloon hits someone or not, it will eventually end up somewhere," expressed Bart as he scratched his chin.
"I'll go back to what I was doing," stated Lisa as she walked back inside.
(Meanwhile, at Gravity Falls)
Gideon Gleeful, in another attempt at getting Mabel's affection, showed her a few flowers and cleared his throat. "Dear Mabel, who has the greatest fashion sense and the greatest braces I've ever seen, would you be my girlfriend?" asked Gideon, flashing a smile.
All Mabel did in response was sigh in frustration. "Look, Gideon, it doesn't matter what you do: I won't be your girlfriend!" blatantly told Mabel to the chubby kid in response.
Gideon threw the flowers away and then threw a tantrum, getting on the floor and slamming his fists on the ground while whining that "Be my girlfriend!" repeatedly. Mabel yawned in a completely bored manner shortly after the tantrums finished. Seeing this, Gideon got up, wiped off the dust from his clothes and then looked at Mabel with frustration.
"I'll make sure you see that I'm meant for you!" proclaimed Gideon, who started to run away before he turned around and shaked his fist in frustration, "Even if I have to thrown something at your head so you'll change your mind!"
Mabel rolled her eyes and turned around, just as the water balloon Bart threw appeared from the skies and headed to the shack's door, hitting Mabel in the process. The girl turned again and gave Gideon a furious glare, who understandably panicked a bit.
"I didn't do it!" voiced a defensive Gideon.
The End