I agree.
A closing scene I have always liked is the end of "Tombstone." After all of the gunplay and death, the movie ends with Kurt Russell (Wyatt Earp) and Dana Delany (Josephine) dancing in the snow, while Robert Mitchum narrates what their future would hold, closing with Mitchum describing Earp's funeral in 1929, with the final line: "Tom Mix wept."
Of course, "Casablanca" ends with maybe the best final line ever: "Louie, this may be the beginning of a beautiful friendship," a perfect end to a classic film.