Crate arrives via a trolley (controlled by noone, it moves by itself?). The trolley lowers the crate onto the floor and wheels itself off screen.
We see and hear the crate moving up and down, with the padlock moving about, as the Christmas tree inside tries to escape. Eventually it bursts out, and the Christmas tree performs a flashy somersault into the foreground.
Whilst doing the somersault, the decorations (from inside the box) fly up into the air. The Christmas tree catches each decoration, one by one, onto itself without letting one hit the floor. (or maybe at the end, while the Christmas tree is posing, one ball falls to the floor and shatters?)