Thought I would start this thread mainly due to the critical I hit in a 10man Ulduar.
First im a 80 Moonkin with a average dps rating of 3 to 3.5k dps.
I had a flask of worm drink (125) Spellpower, blessing of kings, and Gift of the Wild.
I dont have a screenshot but it was against the Mechanical boss in the Seige Area.
First hit was 20,000k with Starfire which was then followed up by
21,600k Starfire Critical..... OH YEAH! I didnt have both my T8's at the time and have a few other better items including enchantments. So im sure a higher one is yet to come.