Electricity

Divide the students into two teams. Each team stands in a line holding hands. A beanbag is placed within easy reach of the last member of each team. A question is then read to the class. If a student knows the answer, he squeezes the hand of the person next to him. The squeeze is then passed down the line to the last person. As soon as he feels the squeeze, this person picks up the bean bag. The team that picks up the bag gets the first shot at the question.

--Neil Chalmers