I had one time (before the days of EB) that I forgot to check the two of us back in at 24 hour mark. It was during Spring Break so it was a busy time. When I finally remembered and got our boarding passes, we were "C's". Well, to make a long story short, the plane was overbooked so we had gotten the LAST TWO C's available!! We were the very last two people to walk onto the plane.....walking down the long isle, looking for a seat. Finally, the flight attendant showed us where the last two seats were....at the very back, one in front of the other, both window seats next to two sets of family of four who had taken the isle/middle seats, leaving us two window seats. I would always get EB at least for the trip home.