I attached my camera to a tripod and held it above the heads of my subjects. I told them to pretend I had taped 20$ to the lens of my camera, and for them to acquire that 20$.
I printed the photos at the size of American money and carried them in my wallet for a week. When I presented the photos in real life, I reached into my back pocket, opened my wallet, and pulled out the photos.
Size of American Money