A drinking container cap is provided having an exterior surface, and an interior surface, with the interior surface having a stirrer depending downwardly therefrom. Preferably the interior surface has formed thereon a stirrer receptacle, with the stirrer receptacle itself being generally cylindrical....http://www.google.com/patents/US5586676?utm_source=gb-gplus-sharePatent US5586676 - Beverage container cap with stirrer
