As The Flintstones' primetime run was nearing its end, ABC arranged for a crossover of a sort with Shindig!, resulting in series host Jimmy O'Neil and the Beau Brummels appearing on The Flintstones during the 1965-6 season, which would be the final season for both Shindig! and The Flintstones.
As a result, here's the Beau Brummel(stones), performing "Laugh, Laugh". Don Messick, the do-everything supporting player, is the Shindigrock! announcer.