Show an ordinary corked test tube, inside visibly rests a small silver rod.
You cause the rod to bob & float in the inside vial! Then the rod actually pushes the cork up out of the tube!
It hops out of the vial to the magicians hand and it proceeds to wiggle around.
Now it actually floats up into the air, hopping right around in spacebetween the hands. It bobs around, it flies from one hand to the other.
A ring can EASILY be passed over the rod while it is in mid-air!