Qayamat Se Qayamat Tak or QSQT - 1988

Starring
Aamir Khan as Raj
Juhi Chawla as Rashmi
Goga Kapoor as Randhir Singh
Dalip Tahil as Dhanraj Singh
Ravindra Kapoor as Dharampal Singh
Asha Sharma as Mrs. Saraswati Singh
Alok Nath as Jaswant Singh

Directed by Mansoor Khan
Produced & Written by Nasir Hussain

http://en.wikipedia.org/wiki/Qayamat_Se_Qayamat_Tak

This blockbuster movie started a new era of Hindi Romantic movies.
In 90s after this movie girls were about Aamir and guy wanted to be like Aamir , even some Actors too :). Lots of romantic movies after this were inspired by it .

'Qayamat Se Qayamat Tak' remains my favorite of the lot. It is a somewhat dramatized but humble adaptation of Shakespeare's 'Romeo and Juliet'
'Qayamat Se Qayamat Tak' is one of the most memorable tragic love stories on the Hindi cinema screen. What makes this film unique is the incredible chemistry between the two leads , their characterization, strong script, dramatic scenes , cinematography and awesome songs.
It's a must watch if you haven't seen it , talking about which I have seen it 22 times in theater when it was running packed house.