When none of them can figure it out, which would mean most of the time, you then try to do it yourself. The secret to this trick is fairly simple- just cross your hands when taking hold of the rope. When you cross your hands, you are seemingly making out a knot with your hands. When you have done this, try to get hold of each end of the rope. Then try to uncross your hands. As you to this, the tie that you have made with your hands will transfer to the rope. Therefore you have successfully tied up a knot in the rope without letting go of the ends while doing it.
The Unbreakable Match
This magic trick may require some bit of preparation. You would need a handkerchief with a hem or sewn fold on the edges and two wooden matches or toothpicks. Before you show the trick to the audience, place a toothpick or a wooden match inside the hem of the handkerchief beforehand. Then let a volunteer to choose a toothpick or match from several others that you have brought with you.
Once a volunteer has chosen a toothpick or matchstick, lay out your handkerchief on the table and place the chosen matchstick in the center. Roll out the handkerchief with the matchstick covered in the middle. As you do this, try to get hold of the matchstick hidden in the hem by feeling it and then let the volunteer touch it. Have it confirmed from the volunteer that there is indeed a matchstick inside. You can then either break the matchstick in half or you let the volunteer do it.
Take the rolled up handkerchief back and then break the matchstick again. Your audience will think that the matchstick that was broken was the one that they saw rolled up a while ago.
Slowly unroll the handkerchief and show them the matchstick, still at the center and unbroken! Now that's an easy magic trick to learn and try with your friends.