Making shaky eggs using finger bones is an excellent idea, Imperial Torturer. Ideally, they should be made from the finger bones of adults who distribute shaky eggs to children at jam sessions and encourage them to "join in" while serious musicians are attempting to play.

Alternatively, they could be made from the finger bones of drunks who attempt to play one of my instruments without permission.

Bee-dubya-ell aka Mister Bones
Imperial Ignoramus, Creator of Fine Ossuaries, Purveyor of Shaky Egg Rattles
His mark: <¡!>