Scully: [holding an Apollo 11 keychain] I actually was thinking about, uh, this gift that you gave me for my birthday. You never got to tell me why you gave it to me or what it means, but I think I know. I think that you appreciate that there are extraordinary men and women and extraordinary moments when history leaps forward on the backs of these individuals, that what can be imagined can be achieved, that you must dare to dream, but that there's no substitute for perseverance and hard work and teamwork because no one gets there alone; and that, while we commemorate the... the greatness of these events and the individuals who achieve them, we cannot forget the sacrifice of those who make these achievements and leaps possible.

Mulder: I just thought it was a pretty cool keychain.