When Nicholson pulled a gun on DiCaprio during `The Departed` shoot

New York: Jack Nicholson pulled a gun on co-star Leonardo DiCaprio to bring the edge in a scene of `The Departed`, reveals director Martin Scorsese.

"The first thing Jack did was sniff the glass and say, ``I smell a rat``.. And then he pulled a gun on him," the New York Post quoted Scorsese as telling told Richard Schickel for his upcoming book, ``Conversations With Scorsese.``

"He didn`t tell me he had a gun. It was great... we took a lot out, but Leo``s reaction is real-time.

"I still get chills, when Nicholson says, ``I smell a rat.`` It`s so real to me," he said.