The most sad movie that I ever seen

Hachiko, a dog's story is one of these movies that makes me cry such that you'll have to go to the bathroom at least three times to wash your face full of tears. 

A year ago I saw this movie with my girlfriend, and we both cry like babies. the history that tells you is very simple, a guy finds a dog in a train station after his work as professor, he adopts the dog (called hachiko because when the professor founds him the dog have a collar with that name) because the train station chief tell him that if he don't take the dog with him the dog will be abandoned.

After that, the dog accompany the professor to the train station every day and he waits is arrival in the night. Suddenly, the professor suffer a heart attack in the work and die, this is the sad part of the movie because hachiko waits his arrival every day. No matter what happens, no matter the weather, hachiko always stay in the front of the train station, waiting the arrival of his owner. And this fidelity touch my heart. I recommend this movie a lot.