There's a moment in Pulp Fiction where Samuel L. Jackson explains to John Travolta how TV shows get made, saying
"Well, the way they pick TV shows is, they make one show. That show's called a pilot. Then they show that one show to the people who pick shows, and on the strength of that one show they decide if they want to make more shows. Some get chosen and become television programs. Some don't, become nothing."
In the case of these absolutely nuts 10 shows, they're the ones that became nothing.
It was meant as a much racier version of the popular sketch comedy show Laugh-In, but it was apparently too racy for both audiences and networks in 1969. One station didn't cut back to the show after the first commercial break, while several others refused to air it at all, making it the only show to be canceled before the first episode even finished!
The Melting Pot (1975)
Spike Milligan was an immensely influential TV comedian (he's often considered the inspiration for Monty Python's Flying Circus) and he had a string of successes with shows that were both funny and also socially conscious. The Melting Pot, where he starred as a Pakistani immigrant (complete with dark makeup, yeah) dealing with racism in Britain, was not one of them.
Co-Ed Fever (1979)
Thanks to the success of "frat-house" movies like Animal House, CBS tried to cash in on the trend with Co-Ed Fever. However, only one episode was ever shown in a "special preview" timeslot, and ratings were so low that the rest of the produced episodes were never broadcast.
Comedian Melba Moore was all set to star in a new sitcom named after her, but the morning it was supposed to air, the Space Shuttle Challenger exploded above Cape Canaveral. The nation was in mourning, and Melba was toast.