Kamera Kastros and Berywam

Don't you just love pranks where no one gets hurt and no property is destroyed? The French YouTuber Kamera Kastros recruited a carload of talented beatboxers known as Berywam to surreptitiously add sound effects to unsuspecting people. You don't have to understand French at all to follow what's going on here. They've set up in a public square that is apparently popular for exercise. A speaker hidden in a backpack broadcasts the sounds of people walking, eating, stretching, jumping rope, climbing stairs, and other activities, generated by the guys hidden inside the car. Sometimes the mark figures out that they control the sounds, while others are completely unaware.  

There are also a couple of interludes in which they challenge guys on the street to imitate well-known beatboxers, and then spring Barywam on them as accompaniment. After all, you can't have a day with a popular recording group and not show them off a bit, ya know? A good times was had by all. (via reddit)