Sometimes a boss just seems to get lucky.
You know what I'm talking about: you just see 1% wipe after 1% wipe and you don't know what else you can do to get over the edge. Do you need more DPS? Are the tanks dying? Are the healers going OOM, or people standing in stuff that's killing them? What's the important thing you're doing or not doing to get that last little bit of performance out and kill that big loot sack on legs in front of you? You tweak strats, and then tweak them back, you play with raid comp, you change positioning... sometimes you get that little click and it all falls into place and some times you don't, nothing seems to work. Whether it's a PuG wiping on Garfrost or a raid working on the Blood Queen, things don't always go our way.
So what do you do? Are you the 'stomach it out' type who won't leave until it's dead or someone else pulls the plug? Are you a tinkerer always coming up with new strats and new approaches? Are you the "this is what I read on Wowhead" guy? How do you move past failure to success?