When recently renting a car, there was an option to rent a mystery car. It was an option to rent an unspecified type of car that would be cheaper than they would otherwise be. It was suggested that it would be either a hybrid or electric car, and that was exactly what I was hoping for. However, what I got was a giant pickup truck, which as the polar opposite of what I was hoping for.
This was disappointing. It was a lesson for me to avoid mysteries.