This is because the space-time continuum and god himself said the first shot must not hit the desired target. Therefore every time you hit your first shot you have destroyed a reality that existed independently from ours, a reality that had its own physical laws and was self-contained. Concluding my statement every time such occurrences happen you feel satisfied as not only did you hit head but unconsciously destroyed a reality other than yours releasing dopamine in the process and making you enjoy hitting head first shot.