History time kids! Two Frenchmen called Pierre Barillet and Jean-Pierre Gredy wrote a play called Fleur de Cactus, which in the 60s was turned into a successful Broadway play called The Cactus Flower. In the late 60s, the Broadway play was made into a Walter Matthau, Ingrid Bergman and Goldie Hawn film of the same name. In 2005, any of these (or maybe even all of these) unofficially became the source for the David Dhawan film Maine Pyar Kyun Kiya? (really, with Dhawan, who knows which of the three source materials he mined for his 'inspiration')