From The Movie 'Aan Milo Sajna (1970)' : Must've heard the song 'Achha To Ham Chalte Hain'. The song has very interesting story behind its making.
Anand Bakshi we all know he was a famous lyricist.
Once he was sitting on his chair with a copy and a pen. He had to write a song which should be little romantic and funny but he was unable to write a single word of the song. He spent approx 10 hours for some idea for the lyrics but he failed. Laxmikant-Pyarelal was also sitting beside him and waited for him many hours.
At last the lyricist got tired and said- I can't do this. Achha to ham chalte hain. Then one from Laxmikant-Pyarelal said- Phir kab miloge. Suddenly the producer of the film said- Got it. This can be a line of that song. Everyone became happy and quickly Anand Bakshi wrote the song and Laxmi and pyarelal composed it in a few hours.
This is really a beautiful incident which relates to a song which is so hit.