Okay, found something neat while searching for new exploration/exploit spots in the new Darkmoon Island released in 4.3.
1) Talk to the cannon goblin, then do /logout. Order doesn't really matter.
2) Once you have the logout timer up, pay the ticket to enter the cannon - though you wont enter it.
3) Cancel the logout.
4) 5 seconds after pressing the "Enter cannon"- button, you can move wherever you want and after the 5 seconds you'll get launched in the direction you were facing.
It's fun for example to fly on top of the deathmatch tent and get all the whispers asking you how you got there :P