I believe it was David Regal who performed Cups and Balls and Cups and Balls. I remember reading that routine in one of his books. He had a charming presentation where he reminisces about his first magic kit and how it came with a set of brightly colored plastic cups. He talks about how he progressed in magic and soon moved to using more professional props and he goes about his routine with his brass set of cups and balls. For the surprise ending, he produces the brightly colored plastic cups from underneath each brass cup, complete with matching balls. Not half bad.
My favorite ending for Cups and Balls was making each cup completely solid in the end... as in they had no mouths to fit balls underneath anymore. I always thought it was a great, puzzling and original ending.
RS.