Hope these haven't been mentioned before...
You know your way around town from running.
People around town, even if they don't know your name, know you when they see you in public because they see you running everywhere.
You've gotten lost on a run--and kinda enjoyed it.
You dread the tapers.
You'll run anytime through anything to get your run in (thunderstorms, two feet of snow, 2am, etc.).