Bill "Yup this is a song that I would sing down on my enemies."
Dipper "That doesn't surprise me."
Mable "Looovvveee, Looooovvveee"
Stan "Mable! Quit that singing that song, it's creepy."
Soos "But you have to admit Mr. Pines, it's quite catchy."
(Ford) "He's insane."
Shinshinjane 'You're one to talk.'
Wendy "What's with the image?"
Pacifica "Yeah, its so..."
Robbie "Dark and gloomy. Nice."
Gideon mutters to himself "I need an evil song."
McGucket "It's the end time!"

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Gravity Falls reacts to...
FanfictionMany of the cast of Gravity Falls are force to watch everything that pops in front of them like a video add. This makes my fourth cast react to stories.