From a really gross web site that I was introduced here on Allnurses. I have heard a variation of this one before but thought it belonged here.
One elderly patient resting in a hospital bed asked the day nurse if his testicles were black. Exhausted and cranky, the nurse yanked forth his sheets and pointed with an outstretched finger, stating loudly that the man's testicles appeared just fine and that SARS was exclusively a respiratory disease. Embarrassed, the patient pulled the heavy cloth mask from his face and informed her that all he wanted to know was if his test results were back.