The entire 13-14 season (apart from the Chelsea and Palace games).. We didn't end up winning anything but it was the closest we've ever come to the title in my lifetime and it was the proudest I'd ever been of the team (I was too young to really appreciate what winning the Champions League meant at the time), was also a pleasure to watch the greatest striker in World football play for my club.
The whole World Cup.. in particular the Greece game against Ivory Coast when Samaras scored an injury time penalty to send them through to the knockout rounds