New Delhi, Jan. 12 -- Actor-comedian Sunil Grover and actor-producerAamir Khan have turned a viral comedy moment into a sharp piece of pop-culture marketing - and audiences are clearly enjoying it.

Days after Grover's spot-on imitation of Aamir Khan went viral on The Great Indian Kapil Show, the duo reunited in a new promotional video that cleverly extends the joke. The clip, released as part of the promotions for Aamir Khan's upcoming production Happy Patel, is being widely seen as a textbook case of moment marketing done right.

The video opens with Vir Das walking into what he believes is Aamir Khan's office. Inside sits Sunil Grover, fully dressed like Aamir and mirroring his body language, voice and mannerisms with uncanny precision...