I visited my urologist yesterday. In a moment of what I thought was comedic brilliance, I greeted my doctor with, "Hey Doc, how's it hangin'?" I figured that must be the appropriate greeting for a urologist, like smiling at your dentist or pointing a finger at your proctologist.
He smiled, then promptly checked my plumbing with a crusty cold-war era fire hose, or something similar.
He could have just told me that I wasn't funny.