As an Italian teaching physics at a college in the US, I would introduce Newton's First Law, and everyone was serious. Then the Second Law, with students taking notes and focusing intently. But when I mentioned the Third Law, the class erupted in laughter. I couldn't understand what was so funny about this Law. After class, a kind student explained that without pronouncing the "th" properly, "Third" sounded like something entirely inappropriate for a classroom. Pronouncing "th" is notoriously tough for Italians, so from then on, I stuck to "First Law, Second Law, and Law Number Three." Video Link in the comments.