Give your class, whether they are in groups or individually, 10 chances to answer questions. If they make a mistake, friendly monster Dunc gets dunked into the tank of cold, autumnal water!
Press the space bar to cue Dunc, ready for the question. If the student/team gets the answer wrong then press the space bar again and dunk Dunk! There are 10 Dunc's in total, you could also use it as a classroom management tool. Simple dunk Dunc each time your class misbehaves.
Remember to turn your speakers on, this one includes sounds.