Sarah Ruhl's play The Clean House opens with Mathilde, a Brazilian housekeeper, telling a long and very funny joke - in Portuguese. I don't understand Portuguese, and I doubt very few of my fellow audience members in Austin, TX did, either. Luckily, Mathilde's self-induced laughter, gestures, and a summary translation projected for the audience onto a screen make it easy to get the gist. The joke is dirty, and it's hilarious.
Mathilde goes on to tell the story of her parents: They were in love, and they made each other laugh.