So, what are the chances that the beginning of a song sung by the same singer and picturised on the same actor would be the same?
In 1959 Usha Khanna debuted as an Music Director for Dil Deke Dekho. The shooting was nearly complete when Shammi Kapoor heard Usha humming a tune. He liked it so much that asked it to be included in the film. The result was "ham aur tum aur ye samaa.n kyaa nashaa nashaa sa hai" by Majrooh.
The next year Shankar Jaikishen looked beyond Shailendra and Hasrat Jaipuri for the first time and got Rajinder Krishen to write for College Girl. Perhaps Rajinder Krishen too liked the 1959 song as much as Shammi Kapoor, for he added "lovely lovely lovely" to ham aur tum aur ye samaa.n!
Of course both Shailendra and Hasrat were livid with SJ for going to another lyricist. A miffed Shailendra wrote "chhoTii sii ye duniyaa pahchaane raaste hain tum kahee.n to miloge, kabhii to miloge, to puuchhe.nge haal." Which was later tuned by SJ for Rangoli!