bill cipher is your dad, you ang him have a awful relationship, he is immature, aggressive, and doesn't really think of you on the same level as him, you hate his guts, only talking to him when you had too, you had just got out of a very important meeting with him and you started ranting to yourself about him and getting yourself worked up when after shattering a vase you throw a knife at the wall to which your dad is there he caught the knife you threw, he had heard you ranting about him and was pissed, you could tell this was going to be a fight, and he never went easy on anyone in fights