Merkin Muffley: Gentlemen, you can't fight in here! This is the War Room!
- Peter Sellers as President Merkin Muffley from Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964)
The bolded line is ranked #64 in the American Film Institute's list of the top 100 movie quotations in American cinema.
http://en.wikiquote.org/wiki/Dr._Strangelove