A trope mostly in comedic works where, when given multiple explanations for an event, the oddest one is most likely to be true. The inverse of Occam's Razor. As such, it can be summarized as "When you hear hoofbeats; think zebras, not horses." The name is a take off of Occam's Razor, combined with Arkham, which refers to the fictional Massachusetts town in the works of H.P. Lovecraft, and also to [...] [tvtropes.org]