2006: Flexing down the rear wing
Yet again it was Ferrari that unsurprisingly had also developed a flexing rear wing that would bend backwards slightly to reduce drag at higher speeds. Few races later the upper element moved downward under the air pressure and created a rear wing that was actually stalling since the slot gap closed. Although several other teams tried to copy the system in order to gain top speeds they never really match the stunning Ferrari. Among the copycats were BMW Sauber, Renault and Midland. As soon as it became obvious teams spent large amounts of money, the FIA decided once again to ban the system and introduce a mandatory gap spacer as displayed in the image (on a Toyota). As of Canada, it became clear this was becoming more of an FIA season than any other Formula One season before.
I thought it was McLaren who first tried the flexing wing-mount structure.