I am shopping for a new car, and have my eye on a shiny Fastwagon XP4.  
The local dealer tells me that every new Fastwagon is sold with a full 
tank of Jumbogas gasoline, which is reflected in the final price. I would 
prefer not to pay the extra charge for it. Instead, I would prefer to 
drain the tank of my rusty old Sixmobile 480, which I'll no longer be 
driving, and transfer that gas into the new car. The dealer states that 
they can not sell me a new Fastwagon with an empty tank, because the 
Fastwagon company has signed a contract requiring them to fill all their 
tanks with Jumbogas fuel.

I look around, and see that I can buy an almost as shiny Boulevard Cruiser 
for a little less than the Fastwagon, since the Boulevard company is not 
under contract with a fuel company, or one of those stylish electric 
Fruitwheels for considerably more.

In the end, I decide to buy the Boulevard Cruiser, because after some 
reading, I find that it will run not only on gasoline, but also diesel, 
gasohol, old french fry oil, and moonshine.

The local Fastwagon dealership tells Jumbogas that I bought the Cruiser, 
after they see me drive by and wave. Jumbogas's legal department accuses me 
of pirating fuel. I made a deal with the manager at MechaBurger to get 
their used grease; I didn't steal it. I don't think I'm a criminal, I 
think Jumbogas is just upset because I didn't buy their fuel.