About ten years ago we had a sales rep. at the company that drove a VW Golf with a manual transmission. He took the car to a local quick oil change business and got really screwed. The person who changed the oil saw a cap and decided to remove it and add fluid. The cap happend to be for some sort of visual inspection access for the clutch. The empolyee at the shop poured an unknown amount of brake fluid into the hole. The clutch which by the way was recently new was ruined. As I remember I believe that he had to take the shop to court for the damages. (OH, Look, theres a cap. What shall I pour in there?)