Prince of Persia: The Two Thrones GameCube

Pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, A, Y, A, Y.

Just before the first chariot ride, while your still Dark Prince, you're in a courtyard with a giant steel gate barring your way and foot soldiers appearing periodically. At the far end, there is an alcove that the soldiers fall into and a pole you can climb, leading to the underside of a balcony. If you're confused, there's two of them practically side by side, supporting the balcony. If you climb to the top, Kaileena's voice will start talking, sounding very broken up. She will list names and what part they had in making the game. It's basically a clip of credits. I found it on hard mode, but it's probably available on all difficulties. Also, don't linger for too long, as you are still in Dark mode and your health drops continuously.