From the Swiss Master of Rope Magic, Pavel!
A length of rope is tied into a large loop. The center of the loop is cut. The knot in the middle of the rope is untied which results in two equal pieces of rope. The performer keeps just one of the four rope ends in his hand and drops the rest.
Amazingly, the falling pieces restore openly into a continuous length of a solid rope. A spectator is invited to pull on it to prove that the rope is apparently not gimmicked.
Written English instructions included.