Not on the Internet, but here in the UK BMW have a tradition of running some pretty good April fools print ads - full page spreads in the reputable papers. In the past they've had the new 3 series that connects to your oven so you can start cooking your dinner as you leave work and have it ready and waiting for you when you get home; and the introduction of a new model that, to help drivers that travel between different European countries where you drive on different sides of the road, doesn't have a steering wheel and instead is controlled from either front seat using gestures and waving your arms (although it requires the passengers to sit very still to prevent accidents).