It is a perfect fishing day, you get to your spot, make a great cast, and bam! a fish strikes, you set the hook, you fight the fish for a brief time and then, slack. The fish has gotten off, thrown the fly, broke the tippet, or what ever, but the fish is gone. Do you cuss, blame yourself, blame your equipment, or just laugh it off? I used to get real upset but not anymore. The way I look at it is more power to the fish. He may have beat me because I didn't not land him, but I won because I fooled him into striking the fly. If I get the fish to the bank and it flops off or if it gets off just before I land it in the net, more power to him. If a fish strikes my fly I consider it a success. If a fish strikes my fly and gets off, I still count it as a success. I don't have to land every fish to be successful or to have fun. If it frustrates you to the point of ruining your day, find another interest.