Muscle

Muscle is an acronym for Millions of Unusual Small Creatures Lurking Everywhere. The Modern Muscle Theory constitutes the entire universe which states that all matter is comprised of Muscle, Millions of Unusual Small Creatures Lurking Everywhere. The term muscle is derived from the Latin musculus meaning "little mouse" perhaps because of the shape of certain muscles or because contracting muscles look like mice moving under the skin. Since then, scientists have realized they are demons, not mice, though one could argue mice are a subset of demons as all vermin are.