USB “Dead Drops”
I would not take the time to do this procedure but found it very curious.
People are stashing random information on thumb drives and cementing them into walls. Why?
Around the world, people are filling up USB drives with everything from personal stories and events, then hiding them inside walls, steps and phone booths in the hopes that strangers will find them. It’s based on the espionage concept of a dead drop—the idea that any sort of container can be left by Person A and picked up by Person B without them ever having to interact. Except there’s one important difference: In this case, Person A doesn’t know who Person B will be.
Sidewalks Chalk 