Did you know that you can be on the mount with a costume? If you got the buff, and mount you will dismount.
Now to the exploit.
You need someone with a Hallowed Wand - Ghost - Item - World of Warcraft etc. and your self + a mount
Now you just have to mount up and get your friend to use the Wand! Simple!
I searched for this but didn't find anything so I thought I could post this. Please tell me if I'm wrong and this is a repost.
Feel free to move/remove my thread.
GLHF
-Morten