Ok so what happened is:
I was leveling on my lvl 4 Goblin hunter, i had the hotrod, i was driving around and my net disconnected but i was still in the game (playing offline) so when i tried to click the "Leave vehicle" button i couldnt move for 3~ sec, same with right clicking the buff, so i was driving around still offline and i jumped off a cliff and in the air i clicked the "Leave vehicle" button and i froze in the air, so i jumped from the air strait up (It can jump without moving) and clicked the button again, i was maybe 1~ yard higher, i kept doing it and i was able to go to the volcanoe (No lava in it) and around kezan (was able to drive on the bottom of the sea :3 )
So what you have to do to recreat this is:
*Enter any vehicle that can jump strait up (also without strait up jump it is possible but then you have to jump like you would do a walljump)
*Put on the vehicles personal speed buff (recommended if it has :P )
*DC so that your still playing but your offline
*Jump and in the air press "Leave vehicle".... rinse and repeat.
(I know this aint that imba but it is cool for places that you cant fly in)
Here is some screenshots i took from going around kezan:
ImageShack Album - 9 images
Hope you liked this.