I massaged a client a few days ago who had tattoos that made me laugh out loud. Which, by the way, is completely unprofessional, but the client was very understanding.
He had a tattoo of HIMSELF on each shoulder, one as an angel in a contemplative pose, and one as a devil looking angry with a fist raised. He pointed out to me that the devil was slightly smaller than the angel, indicating that his conscience was stronger than his "evil" side.
Honestly, unless the client mentions them, I make no comments during the massage about any tattoos or other body art, this just took me by surprise!