Square Knot Rope

What a great QUICK sight gag!
If you like silly puns, this one is for you!

Makes a great opener for a rope routine.
Ask your spectator if he knows how to tie a square knot.
Tell him that you do, and proceed to tie the two ends of a rope into a square knot.
Yes, a square knot, you say!
And then pull on the sides of the rope- IT BECOMES AN ACTUAL SQUARE OF ROPE!

After the laughter, you can proceed with a real rope routine, or you can continue with a comedy routine.
You have successfully set your audience up for either one!