Perhaps one of the simplest and more diabolical devices I saw.

During 1999 Christmas I made a couple of dozens that were gifts for all my family for the New Year celebration. Of course, I put the stick to their coats (sometimes twice). My mother took out hers in 1 minute; some others went to the laundry sometime.

You can make one even with a pencil. The loop must not pass around the opposite end of the stick.

• Solutions

Many people know it, but I'm not going to spoil this wonder