3Z Scale Bulldog RC Rider, a remote control monster truck you can ride
The "Bulldog RC Rider" is a 1/3rd-scale remote-control vehicle with a 110cc engine, disc brakes, five-spoke aluminum wheels, and an optional bad Steve Vai funk soundtrack. But unlike most R/C cars the Bulldog can be converted into a pint-sized ATV, easily ridden by what appear to be grown men. It's sort of a strange combination of hobbies, but I like it. It's just too bad that you can't hand the 2.4GHz controller over to a buddy and have him try to shake you off while you're riding. (Converting it to an ATV deactivates the remote controls.)
The whole rig will cost something like two grand once manufacturer 3Z Scale gets it to market. [via Hobbymedia.it]

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Sorry... holy video promo fail. This is how it's done right: http://www.youtube.com/watch?v=cM2SWNCes5g
It appears to be designed to run in circles.
How extraordinarily nerdy in a NASACR sort of way.
I've always thought it would be fun to convert a kid's atv to r/c.
Now I know for sure, it would be a blast!
This thing would be awesome if the RC had a looong range and the truck a small camera.
So you could do just like Batman and have your car come and get you!!!
You could just sit on the body in R/C mode and have a buddy drive it around. Would make it more of a challenge to stay on with out the extra body parts anyways.