Bill Cipher was traveling through different dimensions, when he stumbled upon the BFDI universe. He obviously wanted to take control over it, so he went in. When he went in, the BFB contestants were confused. Bill Cipher: Hello objects! Shake my hand! Firey: Uh.. okay..? Firey shakes Bill Cipher’s hand, allowing Bill Cipher to take control of his mind. You, a fan of Gravity Falls, knows about this, and is aware of Bill Cipher’s shenanigans. You were also a fan of Bill Cipher himself. What do you do?