I very rarely read the comments lurking beneath YouTube videos; they are, for the most part, the ramblings of mad men. And women.
But when I saw the footer to this Buffalo Springfield clip: 'Stephen Stills is hillarious' (sic) I had to concur. The duckwalk is, by its very nature, a manoeuvre that can in no way be called graceful; there's a time and a place.
Whether or not Stills was in either zone, I'll leave up to you to decide. But he's having a blast, as is Neil Young. Well, it was 1967.