Se trata de los zapatos con la patente 5255452 registrado el año 1992.
US patent (US5255452): A system for allowing a shoe wearer to lean forwardly beyond his center of gravity by virtue of wearing a specially designed pair of shoes which will engage with a hitch member movably projectable through a stage surface. The shoes have a specially designed heel slot which can be detachably engaged with the hitch member by simply sliding the shoe wearer’s foot forward, thereby engaging with the hitch member.
Smooth Criminal -- Michael Jackson
Billie Jeans -- Moon Walk(caminata lunar)