I don't know about FICTIONAL, but The Buffalo Bills were metioned in 'And the Answer Is...'. That's the team on the NFL that Dean Cain had a contract with, before he broke his knee. Hope that helps. They put it in the script as a private joke, I guess.

Quote
MARVIN
Superman. Sorry, I... uh, didn't
know it was you.

SUPERMAN
(smiles)
That's okay.
(studies Marvin)
Didn't you used to play for the
Bills?

MARVIN
Til my knee blew out. Now I do
this. It's much more relaxing, and
_definitely_ less painful.
Julie

Mulder: Imagine if you could come back and take out five people who had caused you to suffer. Who would they be?
Scully: I only get five?
Mulder: I remembered your birthday this year, didn't I, Scully?

(The X-Files)