Another Use
This supermarket is making a quirky situation out of this huge sale of bananas by suggesting that they’re boomerangs. The organic kind. Haha! However, a supermarket would never make a sign like this — out of a lined sheet of paper ripped out of a notebook and taped over one of their professional-looking signs.
This is just a silly joke done by an immature shopper who had an extra sheet of loose-leaf paper from a notebook in their backpack. Maybe they got the idea to do this because they were buying bananas to play boomerang. Since bananas are in a peel that could play a game and then enjoy a snack right after.