Classic Smothers Brothers

I tend to think its somewhat forgotten today just how great the Smothers Brothers were in their prime. They're justly remembered for the strong stand they took against the censoring of material they wanted to portray on their late sixties variety show, but before they were free speech heroes, they were incredibly funny performers (and I suspect they still are). Here's one of their classic routines from, I'm guessing, the mid 1960s.