"This is the (such and such). It rotates (insert direction) and the timing changes from your typical basic. First I'm going to demonstrate the footwork for each role, and th-" "Hey, what's my part?" "Not interrupting. That's your part. (continues with spiel)" And you usually have to repeat it every single time for some people. There are always one or two who screw things up, but then, there are these people who have the best time, improvise, learn something new, and leave smiling until the next time. I'm so glad there are those people, otherwise I'd lament my career change in college more.