Being an Indian, I myself never knew of this gem! You HAVE to check this out, especially if you have an Indian connection:
Many Indians would know Rajesh Khanna as a yesteryear superstar of Bollywood movies (even before they were called "Bollywood"). It's pleasantly surprising to see him in such an avatar!
I don't know if I can get my hands on the full movie, but from IMDB it seems it could be just an intro sequence of a "daydream"...