According to Federal Aviation Regulation (FAR) 61.56:
(c) ...[N]o person may act as pilot in command of an aircraft unless, since the beginning of the 24th calendar month before the month in which that pilot acts as pilot in command, that person has (1) Accomplished a flight review given in an aircraft for which that pilot is rated by an authorized instructor; and (2) A logbook endorsed from an authorized instructor who gave the review certifying that the person has satisfactorily completed the review.
My last flight review took place in June 2004. This means that if I don't have a flight review by July 1st, I will not act as pilot in command of my next flight—which will be my BFR. So my logbook will show a flight in which I'm not PIC, for the first time since I got my certificate. It's no big deal, but it is a point of personal pride.
Thunderstorms are moving through the area so I won't have my BFR today. The next available time is in a week. That leaves three days. Fooey.
This is part of the fun of flying: rescheduling because of weather.