How it looks to the audience:
The magician holds a rope between his hands. There are three knots tied on it, and on the center knot is tied to a wire hanger . The magician says a magic word and FLASH, right before everyone's eyes, the hanger jumps from the center knot to the right knot!
How it is done (don't tell anyone!):
Use a strong piece of rope, about 3' long. It should be about ¼" thick. Take a look at the drawing below these instructions. It shows 4 knots on the rope. Knots B, C and D are regular knots. The hanger is tied to knot C. But knot A isn't a regular knot, it is a "slip knot." It looks pretty much like the others, when pulled by the ends of the rope, comes undone.
What to do:
Begin the trick with knot D covered by your right hand. Hold the rope so that knots A, B, and C are showing.
Say: "Here we have three knots. Notice that a hanger is tied onto the end knot. But watch Abracadabra!"
Now, do two things:
First: pull the rope very tight between your hands. This will cause the slipknot (A) to come undone. It seems to disappear.
Second: Pull the rope again with the left hand. Slide knot D from your right hand. When you do this fast, it looks to the audience as if the hanger has jumped from the end knot to the center knot.
Practice, practice, practice try it in front of a mirror, then when you can do it fast and smoothly, try it in front of your friends and family. It's a great trick.