The reason why I like this trailer so much is because of how much It communicates with such a bare minimum. There are 3 characters, and the conflict is directed by audio rather than animation. There is animation, however because the whole scene is one shot and takes place in just the refrigerator a lot of the movement is left up to the viewer.
I also like how in the end of the teaser, they show a little extra game play of the item being used in combat. The trailer sets it up so the viewer could assume that its a health item or at least something positive, so much so that other characters would go as far as fight for it.
Finally, I like the 2-D elements of the trailer as well, the blend in artistic title screens with graphics, and near the end there are blueprints of how to make the sandwich and what its used for!