Two volunteers are selected from the audience. The ends of a rope are tied around each wrist of one volunteer. The same is done with the second, but before tying, the ropes are linked together.
The volunteers are challenged to separate without removing the ropes.
Most volunteers will go through extensive manipulating, stepping through the loops and climbing over each other, all to no avail. If the volunteers know the secret (a few will), congratulate them and continue with the application. If they can't 'escape', use the method below to set them free.