It's not what you think. This isn't a filmy fight, just a fallout of Imran Khan's quest for the perfect slap for a scene in Mere Brother Ki Dulhan.

On the sets of Yash Raj's latest film starring Katrina Kaif and Imran Khan, what seemed like a simple enough shot soon turned into a slap fest.

Kaif's character is supposed to slap Khan's in an emotional scene. However, Khan, ever on the lookout for innovation, suggested that they make the slap look real.

Trying too hard to follow in the footsteps of uncle Aamir Khan (whose quest for perfection is legendary for the number of people it has both, annoyed and impressed in the film industry), perhaps?

Considering the script called for a single slap, it should have been a simple enough take. Enter Khan, who insisted that his co-star slap him for real, instead of faking it, and that too not once, but 16 times. His logic? So that the director would have a variety of slaps to choose from.

"Left to me, I'd have done just one fake slap and moved on. But Imran insisted that I do it realistically, " recounts Kaif.

She continues, "Imran even called his 'boy' to count the number of slaps. It had to be 16 tight slaps, no more and no less. I don't know why he wanted to be slapped that exact number of times."

Naturally, after the sequence, Khan was seen massaging his face and jaw. Kaif says she isn't proud of the pain she has caused her co-star. But she's happy about how real the slap looks on screen.

"It's the most authentic screen-slap audiences will ever see, " Kaif promises.

Thankfully, it was a slap and not a kiss, or we shudder to think how Kaif's alleged beau Ranbir Kapoor would have reacted. We might just have been in for another slap face-off, this time between Khan and Kapoor. Ouch.