In the 1989 movie "When Harry met Sally" the expression:
When X met Y
Has some other meaning other than the obvious one, or there's a hidden idiomatic expression or a pun?
Well, when X met Y has become the standart scheme for romantic novels/films. Though if you really want to read something out of it intrinsic to the case of Harry and Sally you could maybe see X and Y as 2 different graphs (keep in mind; these letters are normally used for koordinates and not graphs within math).
2 graphs that are in no way equal to another have a very high possibility of meeting over and over again. In fact, if they are to similiar to each other (for example both are straight, or both are parables), the points at which they meet will be limited to a maximum of 1, respectively 2.