Who are you?

Two young men sit on the ground beside a tree, watching a man in a dark shirt who stands and gestures toward a concrete opening in the sidewalk. The man in the dark shirt repeatedly steps back and then forward, as if performing a trick, while the two seated men observe. The scene repeats, showing the man stepping into the opening and disappearing, with only his legs visible, before he reappears. The setting is an outdoor urban area with a building, a tree, and a blue pole.