Preemptive damage

So this customer walks in, and rents a car.
The car he's given is a regular sedan.

"So this is not a very tall car, it has a low clearance, right?"
-"Yes, that's right."

"So when you mark down scratches, can you mark a few dents at the bottom?"
-"Uh, why would I do that?"

"Well, it's a low car and it might get damaged."
-"Exactly, and you will have to pay if you damage it"

"But I don't want to pay..."
-"Then don't damage the car. I'm sorry sir, we don't work that way."