Quizmaster required: Yes
You need a branded glass, for example a Doom Bar glass. The cupmaster will ask if anyone is interested in a game of cups. If someone accepts the challenge they will be given a category and an amount of time ranging from 50 seconds to 1 minute. During this allotted time the player must turn the glass while going through the letters of the brand name, naming things within the given category that begin with that letter. The quickest to do it wins. Should you need to, you are allowed to exchange one of the letters on the glass for a letter of your choice.
First appeared on Radio X, episode 199