A Cross-that-Fish board, 5 fish, and 5 crosses. (or simply done on a chalk board.)

Cross-that-fish is played just like tic-tac-toe, except in teams of either girls and boys, or split the room in half.  You start by asking team # 1 a question.  If they answer the question correctly, they then get to put up one of their symbols (a cross or a fish).  If they answer the question incorrectly, then team # 2 gets a chance to answer the question, and put up their symbol if they answer correctly. The first team to get a tic-tac-toe (Cross-that-Fish) wins.