Ranbir Kapoor and Katrina Kaif have a natural knack for comedy.

A unit hand said, "Ranbir and Katrina possess a great sense of humour. The two make jokes at a drop of hat. Their one-liners can have you in splits. It is this off the set chemistry that has come across on screen too."

The comic sequences have turned out to be simply hilarious. In fact, the unit could not help control their laughter while the comic scenes were being shot. "Not only Rajkumar Santoshi and Ramesh Taurani, but also the entire crew would break into laughter."

The unit had become had become like this one big family. "We had become so attached by the end of it that tears would well up in our eyes when we'd watch Katrina and Ranbir do an emotional scene. But we all kept quiet about it, " said the source.