3. Mickey Mouse Club Circus (Disneyland)

Not long after Disneyland opened in 1955, Walt Disney experimented with an on-site circus show. Tied into the new Mickey Mouse Clubtelevision show, it saw two huge circus tents being set up on the edge of Fantasyland. Two 75-minute performances took place every day, featuring acrobats, aerialists, wild animals and Mouseketeers from the show.

Unfortunately, guests hadn't come to Disneyland to see a circus show, and it proved to be unpopular compared to Disneyland's other attractions. A series of mishaps - including an incident in which a black panther bit the paw off another animal in front of a live audience - led to the circus being removed after just a few months.

2. Cannon Coaster

We've featured the Cannon Coaster on Theme Park Tourist before, but the concept is just so utterly insane that we can't resist mentioning it here again. The ride was by the far most ridiculous of the many unique and unusual rides that were installed at the amusement parks of New York's Coney Island around the turn of the century, and opened in 1902.

George Francis Meyer's design included a gap in its track. The idea was that the train would leap over it, in a thrilling effect that had never been attempted before. Had the park managed to pull it off, the ride would have simulated the "car leaps canyon" seen in innumerable action movies since.

Mercifully, the "leap the gap" concept was never tested with humans. The train was run through the circuit loaded with sandbags, but several crashes resulted. In the end, the Cannon Coaster opened with the gap filled in. That didn't stop it being popular, with urban myths of fatalities during the test phase helping to ensure its popularity.

1. The giant wave machine (Disney's Polynesian Resort)

Dick Nunis is something of a legend of Disney theme parks. Having initially been employed in a "summer job" at Disneyland, by 1968 he was vice president of operations in the company's theme parks division. In 1971, he was promoted again, being named executive vice president of Walt Disney World and Disneyland.

Like many executives, Nunis had his own "pet project" during the construction of Walt Disney World. He was determined to introduce his favorite sport of surfing to the Polynesian Resort, where he hoped to rename the West Beach as "Surfrider Beach". His plan to accomplish this involved acquiring an enormous wave-creating machine from a start-up firm in San Diego, and setting it up on an island opposite the beach.

At first, things look promising. The machine, which used eight enormous "paddles" arranged in a semi-circle to generate waves, was successfully installed and the waves were indeed huge. So huge, in fact, that some feared that they could swamp the hotel if the machine was cranked up too high.

Unfortunately for Nunis, his plans were foiled when it became clear that the return current was eating away the island itself. In the end, the wavemaking machine simply shook itself to pieces, and the majority of its components were removed.