During their dance at the state dinner, Sydney asks President Shephard how he could be so calm with everyone staring at him, wondering who that woman is and why is she dancing with him. His response was that everyone was looking at her and the two answers to her questions were "'Sydney Ellen Wade' and 'Because she said yes'."
The ending. Just... the ending.
Shepherd: Sydney? I didn't send 455 to the floor to get you back.
Sydney: And I didn't come back because you sent 455 to the floor.