Older Ford leather pickup seats would wear after 150,000 miles and 10 years. So Ford hired workers, caking them in special dirt from the Arizona Salt River Valley which will break down leather over time. During testing, these workers wore the same caked-in-dirt jeans and would smear dirt all over the leather seats.
Finally Ford designed a robot to do this testing, after each worker had entered and exited the truck 10,000 times. Based on their results, the engineers created durable seats, while maintaining the soft and supple feel of leather, for comfort and appearance.