] There's a cheat code in the software running the BMW M3's
] sequential manual gearbox (SMG): Press the right buttons
] in the right order and the car will launch you from a
] stop after revving the engine to 5,000 rpm. But don't
] look for a how-to in the owners' manual this feature
] is undocumented, an inside joke of sorts.

Popular Science | BMW's Easter Egg