Stunned into silence

I was talking with my soccer buddy Francesco about the common practice of Italians using their arms and hands when talking.  He related this story:

Visiting from Italy before attaining his current position at Harvard, he had gone to Arizona to do a guest lecture.  After a few minutes, a student in the front row interrupted the talk.  She said, "Professor, would you stop moving your arms so much?  Your hands are blocking your mouth.  I am hard of hearing, and I need to be able to see your lips to understand what you are saying."

Francesco reported, "I was stunned by the request.  I had no idea how I could talk!"