Early bird: worm

We went to the dentist yesterday, and I really miscalculated how much traffic there’d be. The appointment was at 11:00am, and we got to the doc’s office a half hour early. Fully resigned to sitting there reading People or National Geographic (old issues, not new ones), imagine our surprise when they said they could take us ahead of schedule.
Bottom line: we got out of there two minutes before the time of our original appointment. How rare is that?