Dunno if repost or whatever and this is a tip not an exploit I know.
If youre a rogue and you have shadowstep spec, you can write a macro:
For example if someone is in the air with flying mount and in range for shadowstep, the macro will teleport you behind him and do logout which will leave you floating in the air while being logged out.Code:/cast Shadowstep /logout
Just wanted to post as I thought this would be something new.