While shooting in Lucknow for an action scene, Saif Ali Khan was required to chase Gulshan Grover, who plays the villain, with a pistol and a clear intention to shoot him.
However, due to real traffic and people involved and, of course, the age difference between Saif and Gulshan, the former was not convinced the sequence would work.
He apparently told his co-actor, "Sir, I am going to run full force." The latter replied, "Saif, give it your best and try to catch me."
Ironically, Saif was not able to get even close to Gulshan in the three days of this action shoot. In the end, the film's hero hugged his reel villain and said, "You are the fittest senior I have worked with." However the scene was shot with a compromise that Gulshan would run sl0w and Saif would catch up with him.