The most important part in Hindi movies is dialogues. First there was an age of dumb films may be because there were no studios or the system of sound recording. And if at all there was a technique it was highly expensive. So there were films with no sounds.
Alam Ara was the first hindi talkie movie. It was the film which started the trend of dialogues, sound, music etc. in the Indian Cinema. After that probably except Pushpak no commercial film was dumb. So with it the trend of great dialogues started. Ofcourse then the need arose of the dialogue writers. Indian cinema has given many talented dialogue writers. Formerly, many muslims ruled the Indian film industry. They gave beautiful dialogues which are remembered even today also.
Anarkali, Salim tumhe marne nahin dega aur hum tumhe jeene nahin denge (Anarkali, Salim will not let you die, and I will not let you live).'takhliya' (disperse) ”Yalgaar Ho”(Attack)
These dialogues of K Asif’s great film MUGHAL E AZAM are unforgetful. Kamal Amrohi’s PAKIZH had immortal dialogue of Rajkumar saying “ Aapke paon dekhe, bahut haseen hai. Inhe zameen par mat utariyega, maile ho jayenge.” Kaun kambhakht bardasht karne ko peeta hai main to isliye pita hoon k saans le sakoo These intoxicating dialogues by Dilip Kumar in Devdas are remembered today also and were used in the remake of Devdas by Sanjay Leela Bhansali.
Tu mujhe nahin maar sakti. Tu meri maa hai.“Mein pehle ek aurat hoon.” from Mother India were indication of the braveness of a mother of a bad boy son.
These films were a great hit and were seen many many times just because of their dialogues.
Then came an era where people were really bored of typical urdu dialogues. Moreover, people speaking pure urdu were also less.So then came the trend of typical dialogues of Indian cinema. Ofcourse, for that the typical hindi filmy situations were also there.
“Chinoy Sheth jinke khud ke ghar sheeshe ke ho voh dusron ke ghar pe patthar nahin fenka karte” and “jani yeh chaku hai lag jay to khoon nikal ata.” From WAQT by rajkumar
Evergreen Rajesh Khanna said this dialogue to a sobbing Sharmila Tagore in the immortal love story Amar Prem.
Main aaj bhi pheke hue paise nahin uthata.”this ultimate dialogue by Amitabh Bacchan in Deewar was Takiyakalam of all Khuddar heros.
"Saara shaher mujhe lion ke naam se janta hai". by immortal dialogue deliver Ajit in Kalicharan are some of the never ever forgottable dialogues.
"Hum sab rangmanch ki katputliyan hain jinki dor uparwale ki ungliyon se bandhi hui hai. Kab kaun kaise uthega, yeh koi nahin bata sakta."One of the many beautiful lines from the intense Anand, the story of a doctor (Amitabh Bachchan) and his dying friend (Rajesh Khanna)
Then came the block buster of the indian film industry SHOLAY.This is a film where dialogues are simply superb.
“Tera Kya Hoga Kaalia”, “Sarkar maine aap ka namk khaya hai To b goli bhi kha” from sholay were incredibly hit. They were so hit that cassettes of only dialogues were released and they were also equally hit.All the dialogues of the film like "Dhanno teri basanti ki izzat ka sawal hai." Khatron se khelna mere shaukh hai" Arey oh sambha kitna inaam rakhe hai sarkar hum pe" " pachas pachas kos door jab koi bachha rota hai to maa bolti hai beta soja soja naito gabbar aa ajega" "Gabbar se tumhe sirf ek hi aadmi bacha sakata hai aur voh hai khud gabbar" are so famous that they are even copied today.
Many dailogues like "Kya kahu mausi mera to dil hi kuch aisa hai", "Chakki pising n pising"," Basanti in kutto ke samne mat nachna" are used in a comic way also.
This was an age of films with rich dialogues.But nowadays there are no more rich or new dialogues. They have all become very common.The fact is that the situations have become same so the dialogues have also remained same.