It's called the "rule of three". 2 examples to define a trend line, and the 3rd one to subvert expectations. https://en.wikipedia.org/wiki/Rule_of_three_(writi

It's called the "rule of three". 2 examples to define a trend line, and the 3rd one to subvert expectations. https://en.wikipedia.org/wiki/Rule_of_three_(writing)#Comedy https://en.wikipedia.org/wiki/Rule_of_three_(writing)#Comedy