I have a story that works best when I tell it to someone who speaks both English and American Sign Language, because then I can caption the Italian portions with my hands.
We were visiting our ancestral town in Italy, and as we're sitting at the nurse's station in the hospital while they call our cousin to tell him "hey, come in on your day off and pick up your American cousins," one of the psych patients wanders in. He starts trying to hit on my sister. My brother and I both speak enough Spanish to muddle through Italian, but my sister is hopeless with languages. So we're translating for her. He tells her she's "bella" (beautiful). She grins and very confidently says "prego!" at which point me, my brother, and the nurses, all lose it. She has no idea why we're laughing.
Prego = you're welcome
She meant "grazie"