there are many but one that always comes to mind is Nil Battey Sannata.
that is a movie which deals with the relationship between mother and daughter, with the mother struggling to get her daughter to focus on her studies while the daughter thinks of her mother as the villain for not letting her do whatever she wants.
at the end of the movie, the daughter has grown up and becomes a big officer, and gives the credit to her mom.
when the credits started rolling, I started crying uncontrollably. I cried through the credits. maybe I just connected with it on a very personal level. throughout my teenage years I had a lot of trouble with studies, and I watched this movie after having completed my first year of university successfully, so I had perspective to look back and realise how wrong I was back then, and how much my parents have supported me through my bad times.
that movie, along with Bareilly Ki Barfi have made Ashwiny Tiwari one of my favourite directors.