Lawrence of Arabia (1962, David Lean, dir.)
About 1:12 above
[Lawrence has just extinguished a match between his thumb and forefinger. William Potter surreptitiously attempts the same]
William Potter: Ooh! It damn well 'urts!
T.E. Lawrence: Certainly it hurts.
Officer: What's the trick then?
T.E. Lawrence: The trick, William Potter, is not minding that it hurts.