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.