I like lysdectic's suggestion -- Walking around a crowded area like penguins could be fun!
I propose that we walk around like Death. Get some agents to dress up in all-black clothing and hold styrofoam 'tombstones' to their chests and just walk around. The dead can't speak, so you can't say anything, no matter what, even if someone tries to talk to you. The agent's faces could be painted like skulls, and they have to kind of walk in slow-motion.
I propose that we have a big crowd of people around screaming against the tyrants of Britain. How they want to tax us even though we have no say in there government. We could have big banners of like a Give me Liberty or give me death sign. We could have a lot of tea and just pour it on the ground and basically just get in people faces about how Britain is still in control of us and how we have to secede from Britain and become the United States of America
It could be on July Fourth.
and In Britain they could be screaming agaisnt the colonies
Scatter agents over a few blocks on one side of a street with a lot of pedestrian traffic and/or outdoor cafes. One agent starts at the end of the street and begins walking slowly, deliberately, and strangely (enough that people can see something is out of order). Every so often, another agent calmly gets into line, and copies the leader. This continues all the way down the street, with more and more agents filing in.
You don't need much coordination except to scatter the agents. No practice necessary, just file in to line and follow the leader. Just keep a straight face (like this is normal) and pay attention to he leader (or the person in front of you). 15-20 people should be fine, which will cut down on stopping traffic while crossing intersections.
About 150 agents should get together at a local mall (or huge park, like central park) and gather around in the center, pretending to be waiting to see a big celebrity, like Mariah Carey (just an example) either perform or sign autographs. There should be people with signs and Mariah painted across their chests, and albums in their hands. There should even be people crying. For added effect, there should be a table with a sign, two fake security guards, a huge picture of Mariah, Mariah's music playing in the background (from a hidden boombox) and a microphone. After two hours of waiting, someone should address the audience and inform them that Mariah will not be here today.
**Or: We could have a Mariah Carey impersonator (who can't even sing), come on stage and begin to sing her biggest hit, or sit at the table, address crying fans, take pictures, and begin to sign autographs. The agents should pretend that she's the real Mariah Carey and begin to crazy with excitement***