Michael Schumacher (GER) Mercedes AMG F1 W03 DRS and F Duct.
When the DRS flap lifts to give the driver the requisite straight-line speed boost, it reveals holes on the inside of the rear-wing endplate (circled). These holes connect up through channels inside the car to slot gaps on the underside of the front wing, which sucks air from the rear wing, reducing the front wing's effectiveness.
Formula One World Championship, Rd1, Australian Grand Prix, Qualifying, Albert Park, Melbourne, Australia, Saturday 17 March 2012.