Oddly enough James Fazer brought about a lot of such speculation in the early 1900s after publishing The Golden Bough. McAllister, in "Tara: A Pagan Sanctuary in Ireland" (pub 1920s) postulated that some of the engraved bone 'plaques' were actually bull-roarers and that some might be ceremonial boomerangs.

Like most theories, even those arrived at independently, this one is not new.