Mobile Mob Pranks

I haven't heard too much about protesters using mobile technology before, but I have heard about other groups using cell phones or text messages to pull elaborate pranks. The idea is pretty similar to the protests, but the result is completely different. Instead of protesting for a cause, the groups are simply providing comical enjoyment (and sometimes a small disturbance) to passers by. I wish something like this would be organized in Madison sometime. It would be neat to be a part of, just to see how quickly things change and the ability of the group to react.