This is not a joke, but it is funny, and true.
I worked at a large grocery store for many, many moons. For a time I was the closing supervisor 3pm-12 midnight. The large end displays are usually for items on special. We would also put other items one might buy along with the special sale item.
For example, if barbecue charcoal briquettes are on sale at a low price, most of the end display is charcoal. We would put lighter fluid (regular price) around the briquettes.
Well.....one night the boss asked me to construct several displays, including a large end display of toilet paper. So.....what do you think would go along, tie in with the special priced TP? The TP end display looks like a battleship; large items all stacked together. I had to find something that would be somehow related to the TP. When I decided what to stack around the perimeter of the TP display, my coworkers stated I could not use it. I responded that all the other bosses and supervisors had left for the day; I was in charge. So, I placed boxes and boxes, bottles and bottles of.... Prune Juice.
The next day, I arrive at work a little early. The main boss calls me up to his office, and is laughing out loud, almost holding his side from laughing so hard. While laughing, he says “How the #&*@ could you build a display like that?”. I laughed, and stated “boss, half of the prune juice is gone, sold!”
LOL