I too fully understand that I'm not driving a 1 of 200 custom ordered exotic, but I don't even entrust my clutch to close friends who I deem merely 'satisfactory' stick drivers, so you can forget some random teenager looking to make some extra cash.
When I had only owned the car for only a few weeks, I once brought it to a full-service car wash...once. (Thanks to car forums, I have since seen the error in my ways and exclusively wash it myself now). Well, when the car comes out of the wash, an attendant hops in and drives it up an incline to the 'vacuuming area'. Well, this jamoke jumps and immediately preceeds to stall the car, violently jerking it forward. Then he starts it back up, revs the tach up and slooooowly lets the clutch out up the incline to the be vacuumed 25 feet away. Now add in the element of you not even being there to watch your car being moved around, and that pretty much seals the deal for me.