Self Tie Shoe Lace

Walk down a busy street with your shoe untied. Complete strangers will INTERRUPT you to tell you your shoe is untied EVERY FEW SECONDS.
So you smile, make eye contact with your spectators, and give your foot a little shake. Your shoelaces start to snap back and forth, criss-crossing... 
If you could move your foot in just the right way you might actually be able to tie your shoelaces without even touching them... 
You give your foot another little shake and this time you get it just right. 
To the astonishment of your spectators, YOUR SHOELACES visually TIE THEMSELVES! 
The best part is, it's a REAL knot and bow! Your spectators can inspect till their hearts are content!  
As seen on TV