People are not allowed to speak to each other. After the photos are all used, switch places. Try to get to the point that everybody screams POW at the same moment. One person stands in the middle of the group and goes to one of the other participants and goes around like a pussycat. If she laughs - she has to change roles.
All participants destroy an imaginary computer with an imaginary hammer.
Compare the original message and the end result. The appropriate people must move to those positions in the circle. This is repeated several times in a round. Rubber bugs in the computer - practical jokes like a rubber spider in the keyboard. All participants close their eyes and grab hands around them.