Watch John Stamos' Surprise Appearance With Beach Boys in Concert
![Watch John Stamos' Surprise Appearance With Beach Boys in Concert](http://www.billboard.com/files/styles/promo_225/public/media/john-stamos-beach-boys-2014-billboard-650.jpg)
Have mercy!
John Stamos channeled Uncle Jesse once again at the L.A. County Fair over the weekend when he joined The Beach Boys onstage. Anyone...
Have mercy!
John Stamos channeled Uncle Jesse once again at the L.A. County Fair over the weekend when he joined The Beach Boys onstage. Anyone...