How about "Some Mothers Do 'ave 'em"?

But I think "Fawlty Towers" is the masterpiece of them all.

The movie "A Fish Called Wanda" could also be quite useful for demonstrating some of the notable differences between American and British culture...plus it has those hilarious scenes with Kevin Kline doing quasi-Italian babblegab to turn on the Jamie Lee Curtis character. You have simply got to have him watch that one. ;-) As an Italian, he will probably find it a bit surprising in places.