Effect: The performer, holding a rope, hands over a pair of scissors to the spectator and asks them to cut the rope in the middle. The spectator fails to open the scissors. They exert their full strength but cannot separate the blades.
The performer takes the scissors and immediately opens them without any extra effort and hands them back over to the spectator with the blades separated. But now they cannot cut the rope because they fail to close the scissors! Finally the performer takes the scissors and cuts the rope.
With the proper handling this can be a very funny little interlude during your Cut & Restored Rope Routine.