The File to Use

The joke plays on the word 'file,' using its double meaning to create a disturbing image. In normal contexts, 'file' refers to a tool used to enlarge holes. However, the answer uses the word 'pedophile', suggesting a horrific association between the act of enlarging a hole and the abuse of children. The dark humor arises from the shock of this analogy, and the unexpected juxtaposition of the technical question and the horrific answer. It's a very morbid and unsettling way to subvert expectations.