‘Hum Tum’ “Ladki Kyon Na Jane Kyon” , sung by Shaan and Alka Yagnik is from the superhit film ‘Hum Tum’ . Composed by Jatin Lalit and lyrics by Prasoon Joshi, the song went on to be a super hit among the youngsters. It was a lyrical fight between Saif Ali Khan and Rani Mukherjee, filled with dialogues and witty remarks from both sides, that made this song popular.