Interesting topic! Gosh! I can go on non-stop in naming all the movies that made me cry like a baby but i'll try to limit it to 5.
Just like everybody else I have to include Titanic as one of the movies that made me cry like a baby. That scene where Kate Winslet lets go of Leo DiCaprio's frozen dead body to sink into the ocean was just heart-wrenching!!
The Road starring Viggo Mortensen was equally sad. The scene where he was about to die and leave his young son all alone was the cue for my tears to roll down my cheeks.
Atonement starring James McAvoy and Keira Knightley was a great movie! I cried at the end where they showed a scene where the two were happily strolling down a beach when in fact, they died before they could ever be together.
The Lovely Bones was beautiful thanks to Saoirse Ronan and Mark Walhberg's portrayal as the daughter that was brutally murdered & the father who avenged her.
and the last one has to be The Lord of The Rings: The Return of The King. The part where Frodo leaves the Shire with the Elves cause he couldn't recover from the journey was so emotional. Just thinking about is getting me teared up.