- that you haven't been rotating your running shoes often enough: you take your backup pair out of the closet to discover that it's become home to a spider web. And to a spider.
- that you haven't been rotating your running music often enough: an old white-bearded farmer sitting in front of the coffee shop compliments you on your humming, and you're really confused, because until he mentioned it, you hadn't realized that you had been humming "Bands with Managers" for a good twenty minutes.
- that you've been studying for too long: you think that "Computability Theorists Do It Without Necessarily Halting" would be a very clever t-shirt.
If you are in Portland, Oregon and you aren't outside right now, I suggest going there, right now. It has abruptly stopped being…