I think that I have what I call 2 perfect races for m, one a 5k where I was not actaully entere but I ran to pace a friend of mine and ended up running about 50 yards in front of the field and kept turning around and stopped a few times to wait for them, I ended up peeling off the course about 20 yards from the finish, my time would have been around 15:05 (yes it was a certified course) and I never came within 40 seconds of that time again. Another was a 15k where I ended up running 48:50 over a fairly hilly course (Borgess 15k in Kalamazoo,Mi. I believe it is now a 1/2 marathon)but I ended up kicking down a sub 4:15 miler in the last 100 yards (I was a 4:30 miler at the time)I felt like giving up a dozen times or so during that race but I decided to just stick it out and everytime he would get 10 yards on me something just clicked and I would close the gap up again, probably the best race I ever ran