YOU SAID:
I will set your mother’s refrigerator on fire
INTO JAPANESE
お母さんの冷蔵庫に火をつけてやる
BACK INTO ENGLISH
I'll set your mom's fridge on fire
INTO JAPANESE
お母さんの冷蔵庫に火をつけてあげる
BACK INTO ENGLISH
I'll set your mom's fridge on fire
That didn't even make that much sense in English.