A small group of spectators is told to watch as the magician moves a few feet away to attempt "a little experiment". Then, without any visible means of support, the magician rises several feet off of the ground before coming crashing down to earth again, perhaps twisting an ankle.
The street levitation, or Bonaduce Levitaton (named for its originator Danny Bonaduce) is simple but effective. All that is required is a pair of pieces of shoe-leather-shaped reflective Mylar, attached to the soles of the magician's shoes.
When the time seems right, the magician tells the spectators to stand where they are and then walks directly away. Because the effect is very angle sensitive, it's a good idea if the magician can convince the spectators to crouch a bit, too.
A little show of concentration is given and then, without turning around, the magician puts feet together and slowly, slowly stands up on tiptoes. The Mylar is revealed and reflects the ground, making it look like the magician's feet have left the earth. After a few minutes of "hovering," the magician drops "back down to the ground," nearly falling over.
"How high did I get?" the magician asks the spectators, holding his arms spread as wide as possible. "About that far?" For psychological reasons, whatever distance the magican shows will be remembered as the distance levitated.