Get a public space that has some sort of sound/PA system. Plant an appropriate number of "agents" (if I may borrow Improv Everywhere terminology) evenly distributed around that space, and have them go about their business, while wearing a small, unobtrusive mike that's attached to the PA system. There should be enough agents that the majority of members of the public can see one agent, but not two. On an unseen cue, all the agents break into song. The song should be something that most people know and that can be reasonably sung a cappella and in harmony by a large group of people. A round of Row, Row, Row Your Boat would do the job, although I'd prefer something cooler. The agents' singing will be picked up by the mikes, mixed together, and played over the speakers for everyone to hear. However, they agents' body language should give them appearance that they're going about their daily business (as opposed to performing in a grand musical production) and that their singing is incidental, like how one might whistle to oneself in an unguarded moment.
The effect for the average member of the public is that they hear a cappella harmony singing over the speaker, and they see (initially) one person, singing mindlessly to themselves along with the music on the speaker as they go about their business.
The goal: see how many members of the public start singing along.
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