The Skeleton Calcium meme, often centered around Mr. Skeltal and the Doot Doot sound effect, is an internet staple that resurfaces every October during Spooktober. Originating from early 2000s internet culture and finding massive success on platforms like 4chan and Reddit, the meme revolves around skeletons demanding calcium to maintain their bone strength. It is characterized by its surreal humor, low-fidelity graphics, and the 'thank mr skeltal' catchphrase used to avoid bad luck. The meme has evolved from simple image macros to complex meta-jokes about bone health and the inevitable arrival of the Halloween season.