The event was the usual feel-good time with fans circulating below a VIP area where the team's family and friends sat. The DJ was loud and the crowd was amped - until the DJ announced a very special surprise guest.
That's when Mia Hamm entered stage right to wild cheers and took the mic, thanking everyone for being there and then leading the crowd in a rousing edition of that old chestnut, the I Believe chant.
Video is courtesy 2 Drunk Fans podcast.
You can be as tired of I Believe as the next fan, but you have to admit that when Mia Hamm is the chant leader, it takes on a new shine.