A school subject which consists of mostly useless shit than you will never use in your whole life.
The only things needed from it are Addition, Subtraction, Multiplication and Division. The rest - Integrals, Derivatives, Prime Numbers, Algebra, etcetera, etcetera, are all useless and will never be needed anywhere in life after school, unless you become a Rocket Scientist.
Person 1: Son, have you done your math homework?
Person 2: Why? It's all bullshit I will never use in my whole life.