As far as 6x6 off-roaders go, the Devel Sixy has to be the most extreme of them all. Consider its features: Six-wheel drive with a carbon-fibre body. Space-age styling that would look right at home tackling sand dunes on Mars. And then there's the 6.75-litre turbodiesel V8 that produces 720 horsepower, with an option for up to 1,500 horsepower. Insane doesn't even begin to cover it.

We got quite a wake-up call watching this monster drag racing a Bentley Flying Spur and demolishing it, but having such superiority over most everything else on the road will cost you $450,000 (about £343,000).