In a quiet server-side update, Apple has given Siri the ability to respond to requests with quotes, notably to suggest that the user is being too long-winded. When asking the assistant a question — presumably one that Apple’s servers find too long or difficult to parse — Siri responds with William Strunk and Thomas Jefferson quotes alluding to brevity.
Certainly a better user experience than simply returning an error for longer questions.
Unsurprisingly, Italian Siri doesn't come with quotes from renowned Italian authors or historical figures. Siri does have a similar behavior, though: in my tests, Italian Siri always commented on the length of my questions, and even told me how one of them was "kilometric".