the other day my preteen son was dancing around the living room singing, i want to be a ninj-cha-cha. over and over. the beautiful and talented alisa and i just looked at each other. what the heck is a ninj-cha-cha? some sort of stealth dancer. when looked for cannot be seen. when listened for cannot be heard. it is said a ninj-cha-cha can dance through walls. heh. if you find yourself at a musical and you don't see or hear anything, it just might be a troupe of ninj-cha-chas. they usually perform between acts. the most famous troupe, and by far the most popular, is one called intermission.