I agree this is kind of annoying, but honestly i think the vast majority of the time people aren't so much lying as forgetting what they actually ran. If you were never really in to running then 5, 10 or 20 years on you really have no idea what a good time was. A guy I knew once told me he ran 8:40 flat for the 2 mile in high school but that he was not fast enough to run in college. I never had the heart to tell him that if he had really run that time he would have been the second fastest high schooler in US history (at the time). I really don't think he was trying to lie to me he was just trying to tell me he had also run and had be a decent HS runner.