#1 Get on your Flying mount.
#2 Press escape and click Logout.
#3 Right click your mount buff.
#4 You are floating.
#5 ???
#6 Profit.
Can't be used for much I don't think, because you have to keep the logout countdown going or you fall. But, impressing friends factor = 10 I suppose. Just down tell them how and you have a big hit at parties. lol