I have no Screen, but my most memorable moment was back in Burning Crusade - Arena.

I boxed with 5 Shaman (i prefer to play w/o external healer). My Opponent was a group of 2 Warriors + 3 Healers.
We gave us a very close fight about 6-10 min.
My first instant crit chainlight (in BC elemental mastery was a crit with no shared cd to nature swiftness) knocked out 1 Warrior.
After that kill they played very defensiv and LOS all the way.
Due my lack of an external player they managed to rezz the warrior.

This match was like an old bubblegum. I never get out of combat and they did LOS with tiny attacks my whole mana to 0.
After they recognized that my mana was gone they were on the way to start the deathblow.
Affected by hamstring and 2 whirling Warriors in my back i tried to drag me from the middle of the arena to a pillar.

At this moment i started thinking for the next match. The next moment i saw that my CD for the IWIN-Buttons was ready.
I refreshed water shield to gather mana for fire nova totems.
i despelled 1 warrior. I placed 5 nova totems. i waited 2-3 seconds and then i threw my uberlightning.
Both warriors gone from 100% to 0 instantly. I couldnt believe this bad luck for the other team and i laughed so hard my ass off.