The first surprise may be that a Halo Warthog will be hidden in Forza Motorsport 4. The second surprise would be Jeremy Clarkson describing it.
The iconic Halo Warthog will be starring as a guest vehicle in Forza 4’s Autovista mode, allowing players to examine the vehicle using Kinect. Sadly this does mean that the Warthog will not be driveable in the game.
But that doesn’t diminish the joy of listening to Top Gear’s Jeremy Clarkson struggling to describe the Warthog.
And here is the original video as voiced by Cortana, the AI character from the Halo series.