Every man knows that a trip to the urologist = one-finger salute. It seems some people still try and weasel out of this, however.
Man (watching urologist put on glove): "Uhh, I was told I need a digital rectal exam."
Urologist: "That's what I'm about to do."
Man: "No, I need a DIGITAL one."
Urologist: "This is my digit *waves finger* and that *points at man's backside* is your rectum."