Incredibly startling and quick visual effect!
Take two purple silk handkerchiefs and tie them together at the corner. Take a yellow silk handkerchief and vanish it. Hold the two purple silks and pull on them- the yellow silk is found to be tied in between them!
Please note: the silks look blue in the video demo. They are not. They are PURPLE, like what you see in the product photo at the top of this page.