At the race I noticed for the first time a remarkable sound the cars make. I first heard it from the GP2 cars on Saturday, and it's a sound that seems only to occur when the cars are on their warmup laps. It must be that the drivers open up the throttle but the clutch is lifted, though not quite in neutral, so the cars edge forward a little; you've got to really know what you're doing or you'll shoot into the back of the car in front of you like a canon. The engine races very hard and makes a stuttering, staccato, keening wail, like the whinnying of a spooked horse. I heard it at the end of the lap, as the cars were about to take their spots on the grid, so it was like horses that didn't want to enter the gate.