When I got 100% Cliffs of Dover on expert (Guitar Hero 3). I have the scars to prove it (I literally cannot play Guitar Hero anymore). And the term Epic Win is dumb as hell.
Edit: I thought I should clarify. On the run where I achieved 100% everything went well, I was so happy I had finally done it, but I then realised what had happened. My pinky had completely locked up, so instinctivlely I used my other hand to move it. It was a sharp quick pain and my pinky has never been the same. Now whenever I straighten my pinky it locks in place and I have to conciously focus on moving it back to normal.