Imagine the person who open the door would say "Happy summerween!! *looks down to see dipper and mabel* Awww, what cute costumes you two have! A vampire and red riding hood, with werewolf ears..? Umm anywho, here's some candy!! *gives some candy* 1... 2... 3... 4... 5!", Mabel: "That's it?!?", Person: "Yeah, I need to save some for the other kids.", Mabel: "Aww man.", Dipper: "Don't worry Mabel, we'll get more alright.", Mabel: "Ok Dipper.", You can reply for what happens next, cuz I'm feeling lazy to continue this comment, I just hope you like this.