McGrath's comment that it was the American western that had the ironic line is spot on. There is nothing at all ironic about Caine's "bloody doors" line (so Americans should be able to understand it), in fact it is difficult to see why it was so funny. Timing, I suppose. There is nothing particularly yobbish, xenophobic or specially English about it either, which are the characteristics often attributed to the Italian Job as a whole. Yet the line does stand out and sets the whole tone of the film.