Props: 3 strips of paper of five feet long, gum bottle.
MAGIC:
Show three ordinary paper loops to the spectators and invite two persons to assist you. Give them one loop each. Tell them 'Do as I do' and start cutting along the middle of the length of the strip of paper, to make it into two loops. Your first assistant tries to do it, but ends up with two interlinked loops. The second assistant finds one big loop which is two times bigger than the original loop!
SECRET:
To perform this trick, you need three strips of paper -- five feet long and three inches wide. You can make them with an old newspaper. When you make them into loops by joining the ends make sure that the first strip (which you will take) is absolutely straight. When you stick the second one give it a single twist and for the last one give two twists and stick with gum.
Now proceed with the trick but make sure that you take the loop which has no twists. Otherwise you will amuse the audience in another fashion.