In a twist of fate, Dev Anand was originally signed to play the lead role of nightclub drummer Rocky in the 1966 film 'Teesri Manzil', produced by Nasir Hussain and directed by Vijay Anand. However, a drunken fight at actress Sadhana's engagement party between Dev Anand and Nasir Hussain over a casual comment escalated into a physical altercation, ultimately leading to Dev's removal from the film. The next day, Nasir replaced him with Shammi Kapoor, who infused the character with his signature wild energy. The film, featuring Asha Parekh and Helen, became a cult classic, bolstered by R.D. Burman's hit score, which included timeless songs like 'O Haseena Zulfon Wali' and 'Aaja Aaja'. This unexpected turn of events not only altered the film's cast but also left a lasting impact on Bollywood history.