I flew AA951 (JFK/GRU) yesterday and was in BIZ. Upon arrival, the flight attendants blocked our exit to allow FC passengers to disembark first (relatively standard procedure). Much to my amusement (and other passengers' irritation) it was like a clown car had let out! I had taken a peak at FC during the flight and there were no more than 5 or 6 passengers. As we stood there waiting, however, 5 passengers from FC left the aircraft, then 6, then 10...15...20! Funny enough, none of the FAs thought this was strange and they still stood there blocking us from leaving! Suddenly, two young ladies came through who were laughing out loud, carrying 3 bags each -- you know, typical coach behavior (JUST KIDDING!!!). It was then that the FAs realized that passengers from the other aisle had just been going around the galley and exiting from the FC cabin! I was in no particular rush, so I found it quite hilarious...