Moonstruck and/or While You Were Sleeping . . . and if it's a full sized downer . . . Truly, Madly, Deeply as well, then I can bawl my eys out and realise that I'm an idiot and life's not that bad after all. LOL
I prefer comedies at any time. Anything with a happy ending makes me feel good. Love Actually or Mamma Mia are happy movies, but I don't have any particular one movie that I choose. I think Love Actually would be it, if I had to choose one. Always think of that Arrivals gate with all those happy people, and it makes you feel good.