Modern cars have computers, computers have software, and software has easter eggs (hidden features with little or no purpose). I guess it was only a matter of time, but the BMW M3's sequential manual gearbox has an actual easter egg.

Switch off the stability system and select shift program six. Switch the engine to sport mode. With the hand shifter in drive, hold it in the downshift position and press the gas pedal. The engine will rev to the preprogrammed rpm and hold. Now release the shifter. The car will launch forward violently and the engine's revs will climb quickly, so be prepared to upshift.

Putting easter eggs like this into cars is obviously a little different to other software: using it too many times in Europe actually voids your warranty.

I can only imagine what sort of hidden features they'll think of to put in our Internet-enabled fridges and toasters.