Since this bit of news, first discussed in the January releases post, was on the front page of the Times of India a few days ago, I think it's safe to say the content of this post does not constitute a spoiler. Yet, you have been warned. :)
Actors Aamir Khan and Shah Rukh Khan play cameos in director Zoya Akhtar's debut film Luck By Chance (official website here) releasing this Friday, January 30 (the film also stars (haaye Allah) Juhi Chawla!). It is said that Aamir and Shah Rukh play themselves and do not share screen space. To the right is Aamir's look (source: the link above; thank you Pitu for sharing it).
Question: The two actors have indeed appeared together in a film. In addition to sharing screen space, they had dialogue exchange! Which film was it? (Hint: Read the title to this post.)
Answer: See comments. A warm digital round of applause for Pitu and Shweta! All comments updated 10:15 PM PST.
PS: I'm watching The Story of India on PBS as I write this (it's not the most factually correct, but it does have some remarkable High-definition footage from all over India), and they just played a couple of minutes from Mangal Pandey (2005)!!!