Press the tilde key (`) and type "open vehicledemo" - without the quotes of course ;)

To get the vehicle to appear you need to run over this funky little hand painted switch. Near the switch you'll see a very small vehicle hanging in mid-air....this is where the vehicle will drop drown from once you run over the switch.

To mount the vehicle press the "U" key and to dismount use the Space key.....

You can have up to two vehicles I believe and I don't know whether you can set up an Internet connection to play against someone else in this mode either. If you find a way let me know!

BTW....You can fire rockets too! Enjoy! Brewskie