Here's an oddball clip - Johnny Whitaker (TV's Jody from Family Affair) singing and dancing on some kind of '70s children's special.
When this aired (1973?), Johnny was experiencing a bit of a career resurgence (Sigmund and the Sea Monsters and Mystery in Dracula's Castle were required kid-viewing on TV, and he played the title role in Tom Sawyer - a theatrical film co-starring a pre-fame Jodie Foster). Despite this, he was very near the end of his Hollywood shelf-life, and was completely off the radar by 1975.
In today's clip, Johnny sings and dances badly - then closes with perhaps the worst joke ever told in public (the audience reacts accordingly).