Audience - people curious. All they need to know! So remember: there are tricks that you can't show in the immediate vicinity of the audience, otherwise they will notice your manipulation. And there are tricks that they, in contrast, is best done by inviting a volunteer on the scene. The focus will be only entertaining.
So is this focus... Invite on stage the audience and let him inspect the props. Pitcher and thick rope. Nothing special about it, of course, they will not detect: they are the most common.
Lower the rope in the neck of the jug and slowly, very slowly turn it upside down. A rope hangs down from the jug down and not falling, as if pinned inside! Moreover, you can take on its free end and release the jug. And he will not fall!
For more convincing shake the jar from side to side: holding on! Now turn the jug into position and easily pull the rope out of the jug. Let the curious viewer more time to explore the attributes of focus and ask him to do the same. It is clear, he will not succeed.
The whole "trick" is to put them in the pot small cork or foam ball with a diameter slightly smaller than the neck.
When you turn the jar upside down, the ball rolls to the neck and jammed the rope. When the pitcher is in normal position, is to loosen the rope, as the ball will fall down. After that, you can take the rope and pass it to the viewer. At this point, don't forget to tilt the pitcher to keep the ball rolled out of you in the palm of his hand.