For me, one of these moments happened last night on my warrior. I answered the call for a Heroic VoA asking for now baddies. People were asked to link their achievements and underacheivers were kicked. My role was actually quite odd. I wasnt DPS. I wasnt main tank or off tank. I was a debuffer and a ferry boat apparently.
We had a Paladin main tanking Emalon on one side of the room and a DK on the adds on the opposite side. I would basically sunder Emalon up, thunderclap, demo shout. When the overcharged add came, I would sunder him up for extra damage. Then I would wait for the new minion to pop up, taunt him, and ferry him over to the DK tank.