It's not even a Repost! and it's not even a real Exploit.. just common sense and kinda Game-Mechanic.
Funny tho! And it works.
Don't like your current Dungeon ur joined via Dungeonfinder or your Group sucks ..whatever.. and wanna get out?
Simply log-off for 4-5mins and the Group will prolly kick you. Tadaaa, ur out of the Group w/o a debuff.
It's SO simple i never came up with this one 'till today^^