This is a duet between Louis Armstrong and Danny Kaye that's been floating around on the web.

When I was in Cancun, we went to a restaurant where they worked hard to entertain you. In this video, the man who balances the goblets stays one or two steps in front of the women who are trying to add their goblet to his stack. If he likes their dancing, he'll kneel and let them put their goblet on the top.