Herman wows the beatniks with his poetry skills.
Note: It was mandatory for 60's sitcoms to devote entire episodes to counterculture hippies (or since this is from early in the decade - beatniks). It's plausible that Herman and the gang could meet a gang of beatniks, and I'll even give you Gilligan's Island and Star Trek (space hippies!) - but when they showed up on Hogan's Heroes for chrissakes...