It was 1968 when Bollywood icons Shammi Kapoor and Mumtaz lit up the screen with the dance number ‘Aaj Kal Tere Mere Pyaar Ke Charche’, a track that still enthrals audiences today. The pair, once among Bollywood's most sought-after on-screen couples, were also rumoured to have been in a relationship off-screen, a spark that reportedly died down almost as quickly as it flared up.