Aug 13th 2008 7:02PM First run of shadow labyrinth, not long after TBC started. Every single mob was duplicated, so 2 of every boss as well. We didn't actually realise until we cleared to the first boss - we'd thought it must have been set on "heroic" or something. Double loots off the first boss ftw, but on trying the second boss, we found that they staggered the mass mind control, and the best way to describe our complete lack of success was "hilarity ensued".
Ever since, that instance has seemed awfully easy ...