Heroic Zon'ozz. We kept trying different strategies so we could handle healing debuffs during black phase, and we weren't getting through a single black phase. Then the raid leaders like "Yo the debuffs goes out on a timer...What if we time the black phase so we don't have debuffs during it"
Everyone's just like ".....how did no one think of that"
After fixing that we made it through two black phases before we wiped, then raid time for the night was over