It's not often I read a long thread right to the end, but you guys are keeping me entertained!
Some of the fish I remember best are big ones I have lost. One in particular stands out. On the Bow I hooked a monster in the late evening on a caddis. I guess I wasn't really expecting the strike, thinking that there were a million caddis on the surface, why would he ever grab mine? But he did. And he was gone really fast before I even got a proper look. But I felt the old primal tug and it was stronger than usual. Then I saw and heard the splash! No doubt -- this was a serious fish. My partner only saw it happen out of the corner of his eye too, but he commented "There was some serious water displacement."
No, I never caught the fish -- he broke off my 4x tippet -- didn't even get a good look, but I'll remember him...