For the video of his 1987 single "Smooth Criminal," pop sensation Michael Jackson devised a dance routine. He leaned forward 45 degrees, apparently defying gravity, and completely blew our minds.

(In reality, the effect was achieved by wires.)

But Jackson wanted to recreate the same dance move in live performances on tour. So, along with two co-inventors, Jackson developed a special shoe. A slot in the heel engaged with a peg, which could be raised and protruded through the stage floor when activated. With the heel fixed, the performer could lean forward into the attached ankle straps. (However, the move would have required some strength in the legs and upper body to achieve and maintain this position.)

In 1993, Jackson and his co-inventors were granted a U.S. patent for the shoe and its magical heel. The "magic" worked perfectly until September 1996 when, during a concert in Moscow, one of the heels came loose from its peg. Michael went flying, but not in a good way. The result was a hasty reworking of the patented design.

The offending shoe, together with its twin, came into the possession of the Moscow branch of the Hard Rock Cafe, where they remained until after Jackson's death. Auctioned off, the shoes fetched roughly $600,000.

Even with a faulty heel, it seems the magic remained.