The group is split into two teams and one volunteer from each team comes forward and places an ice cube in their mouth. Then with the ice in their mouth they have to try and say a tongue twister...(go to http://www.uebersetzung.at/twister/ for a varied collection of tongue twisters). The team to guess what their volunteer is saying first wins. Game can be repeated as many times as you like. note it can also be adapted to have a time limitations as well ie they have to guess 5 tongue twisters in 3 minutes.