"When I became mayor, the one thing that even I wasn't quite ready for is the extent to which every day can hit you with something completely unexpected," Cockrel Jr. said. "So that's the thing I think anybody that's going to be mayor needs to be prepared for. You can have a sense of what your day is going to look like, just based on your calendar and what you have on it. But the reality is, something may come up, it's going to force you to completely recalibrate and do something different."