Planking Level: Ultimate.
This video is of the 2004 Caminos del Inca rally in the Andes, when Driver Rodrigo Alonso Dibos and his cousin and codriver Luis Dibos encountered some kind of mechanical problem en route (I would guess it was a broken throttle cable).
Did they stop? Hell no! Luis Dibos just crawled onto the hood and worked the faulty mechanism manually.
While the car was in motion.
(Hat tip to Rallye Magazin!)