This scene is from the film True Romance, written by Tarantino and directed by Tony Scott.
Tarantino thinks his first scene (Chapter 1) from Inglorious Basterds finally surpasses this one. (at least that's what I read in a newspaper).
Go see Inglorious Basterds (5 stars, btw) and tell me what you think. I still think this "sicilian scene" is awesome.