That's a 30 year old movie. Diane Keaton was actually young enough to play a woman who goes to singles bars. I bet there's not too many people under the age of 40 who remember that movie. The candy bar is probably much better known.
I only remember it because I was 15 at the time and got to see it at a friend’s house on cable. (Crummy movie.)
(Also featured a 27-year-old Richard Gere.)