We knew that the pulse rate and the blood pressures of drivers responded to the psychological stress and the anxiety of the start of a race. Primitive estimations showed these to increase for most drivers - save for Jack Brabham whose pulse went down as did his blood pressure when he got into the cockpit on the grid! In fact, in the 1969 race at Monaco Jack had the rear of his car climbed over by Surtees in the tunnel and lost a rear wheel and his brakes...He skillfully slid the vehicle down the barrier till it slowed and he got out and walked from the harbour to the pits. Cool as a cucumber, his pulse rate absolutely normal, his only remark was that his premature finish meant he could get the early flight out of Nice airport. Picking up his bag, he departed across the circuit at the end of the pitlane with a cheerful wave.