Connection by Kreis Magic
The performer displays a rod, which has a red string at each end. One tag has a picture of a boy, the other has a picture of a girl.

The performer tells an Asian myth, in which lovers are connected by invisible red string. 

When the performer pulls the boy tag down, the girl tag rises as if they are connected. But the center part of the rod is transparent, so audience can see that there is no string between the two tags.