The effect: Explaining to your audience you are going to perform an amazing magic trick you buy or borrow a bottle of unopened drink and remove the bottle cap. You hand out for total examination. This poves to your spectators it is totally unprepared in any way.
Holding the bottle cap in your hands you give it a spin and amazingly it HOVERS in mid air in front of you. You can make it hover from one hand to the other and even rise up and down. Your spectators are baffled! It seems you have total control over the levitating bottle cap. To prove it is unsupported you wave your hands all around it. You make a ring shape with your fingers and amazingly the cap effortlessly floats through!