With a Mouth To Speak, I'D Shriek

They say that walls have ears to hear But not a mouth to speak Though it's mostly for the good, I fear For if I did, I'd shriek Permit me to introduce myself I'm a doctor's office wall My length and width are twelve by nine I'm round 'bout eight feet tall My eyes are on the doctors As they step into my room What I see oft-times sicken me While some patients it may doom So many of these doctors just do not wash their hands Yet without a mouth I cannot shout ~ or softly reprimand