The Bane of her Existence

A·P· cal·cu·lus

ay-pee ˈkalkyələs/

noun

1.

the branch of mathematics that deals with the finding and properties of derivatives and integrals of useless functions, by methods of torture originally based on the summation of infinitesimal differences of mathematicians with OCD. The two main types are differential calculus and integral calculus, neither of which will ever be used in anyone's life, unless one were to make the inexplicable decision to become a high school torture inducer math teacher someday. 

2.  a particularly cruel method or system of depriving innocent teenagers of sleep and oft by default also their parents

3.  bane of her existence (see Exhibit A)

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EXHIBIT A: 

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