One of my favorite moments was during a low level WSG where they had the flag safely in their base.
One of our random scrubs said "omg we need a legion to take the flag back".
I got the berserker buff and soloed the healer + EFC. That was fun.
At 85 it without a doubt was when I soloed the EFC resto shaman while getting punded by a DK and a hunter, then I proceeded to kill the DK, run away (without getting restealth) and then kill the hunter aswell. They all had 120k+ and the hunter even had 135+ but for some reason they never managed to kill me.