Take a high school girl with no more than a burger-flip level of disposable income (and responsibility), then one day put her in a job where she can make thousands of dollars every week. Alcohol, drugs and lots of partying may not be far behind, and that puts a lot of miles on the chassis very quickly.

Those drugs may also help the day after having your ass gaped and pulverized at an anal/gang/train/creampie shoot.