The Hiller VZ-1
This is another bizarre "hover" design that was as ridiculous as it looks. The pilot navigated this thing using their body weight. They could only get up to about 16 mph, which isn't very fast. It was notoriously unimpressive.
The Flying Dorito
The Pentagon really thought it was going somewhere with this design. They threw a lot of money into this design in the 80s, but it was quickly nixed. There was an estimated $165 million in production for just one aircraft!