You know, from the radio show!
== The basic game ==
This could be an excellent plenary session, especially in small groups. The subject matter is written on cards, that are shuffled and placed on a deck. Participants draw a card and have to talk for a minute on that subject.
== Make it harder ==
You could strictly follow the rules of the radio game, where participants must talk for a minute without:
– Repetition (other than the exact words on the card),
– Deviation (saying something untrue or silly)
– Hesitation (umming or erring).
You could choose which rules you're going to follow, and which you're not.
Teams could challenge each other to talk for a minute about different content aspects of their course or topic.