"Superman" (first film)
Star Wars (cues from all the films)
"Star Trek: The Motion Picture" (fanfare, though many non score fans would probably think it was originally from TNG)
"Jaws" (first film)
Indiana Jones ("Radiers March")
James Bond (theme)
"The Good, the Bad, and the Ugly" (the theme)
"Psycho" (piece accopanying the shower murder)
"The Pink Panther" (theme)
"Star Trek [TOS]" (theme, and the famous fight music -- though they would have no idea which episode, and some would not even know from where)
"Knight Rider" (theme)
"CHiPs" (theme)
"Dynasty" (theme)
"Magnum, pi" (theme)
"Quantum Leap" (theme)
"The Rockford Files" (theme; not sure about the last generation of so though)
"The Twilight Zone" (theme, original, second theme which is the famous one)
To lesser extents (remember, non score fans aren't as knowledgable as score lovers, and not anywhere near as versed):
"Lawrence of Arabia"
"North By Northwest"
"Rudy"
"Cool Hand Luke" (Tar laying sequence piece, since NBC used to use it as a news theme)
"The Godfather" (Godfather's theme)
"Chariots of Fire"
"Plunkett & MacClean" ("The Hanging" cue, since it was used in a number of trailers, but I doubt they would know it's from this film; Craig Armstrong, composer; also, another piece was used in a number of trailers, like the first X-Files film, "Escape From Mantua" I think is the cue name)
"Titanic" (Horner's Rose theme, which was the basis of the song; play any cue with that theme music, even if it's no the song, and a number of people would know where it comes from)
"The Mission" ("Gabriel's Oboe")
Possibly the theme from "The Great Escape" (Elmer Bernstein, composer)