This is something cool that I haven't seen in WoW before. The video above is a paladin named Daz on EU Bronzebeard speedrunning Shadowfang Keep in 11 minutes and 17 seconds.
Now, I don't know if that's fast or not, only because I haven't seen anything at all about doing speedruns in WoW. Speedrunning (beating the game as fast as possible) has gotten popular for games in the 8bit era, probably because of emulators and save states, but WoW instances seem like a great place to race through. I wonder why it hasn't happened much yet. Well, except for that one big exception.
One reason may be that, unlike battleground twinking (another "below the radar" kind of competition), the classes just aren't balanced for it-- while the paladin here does pretty well, I'd imagine that at level 70 in a lower level instance, a mage would always be faster, just because they can push out the most AoE damage. But that doesn't mean we can't pit the same classes against each other. Anyone want to give the pally's time a go and see how fast you can tear through SFK?