Here's one some of you will remember — the opening to Uncle Croc's Block, a very odd kids' show that was on ABC's Saturday morning schedule for part of the 1975 season. It started out as an hour, was soon trimmed to a half-hour, then yanked completely from the air, never to be seen again.
Charles Nelson Reilly starred as a gonzo kiddy show host, who was intermittently scolded and heckled by the show's director, who was played by Jonathan Harris. As I recall, there was a loose storyline and it would be interrupted often as Uncle Croc showed cartoons, including M*U*S*H (sort of a parody of M*A*S*H), Wacky and Packy, and Fraidy Cat. The studio that produced it all, Filmation, later recycled the cartoon segments in a number of different ways but the mid-season cancellation meant farewell to the guy in the crocodile costume.
The opening pretty much tells you everything else you need to know…