Dharamji wanted to do Arshad's role in Rabba Main Kya Karoon.
Not many know but veteran actor Dharamendra and Sagar's go a long way. Dharamji has done 4 films with Sagar's namely Aankhen (1968), Lalkaar (1972), Charas (1975), Bhagawat (1980).
So when Amrit Sagar Chopra went to Dharamji to tell him the script of his forthcoming film Rabba main Kya Karoon and get his feedback, Dharamji loved the script. Infact, he was so impressed by the Arshad's role that he even said that If he was young he would have loved to do Arshad warsi's role in the film.
Arshad Warsi plays the role of Akash Chopra's (Main lead of the film) elder brother. Acc to Arshad's theory of romance in the film, when a boy reaches adolescent his harmones starts playing games and you feel attracted to lots of other girls except his wife.. So if he flirts around with other girls he will feel guilty and he will be more romantic towards his wife.