Ha! A friend at uni used to ask that; I used to enjoy the reactions of those who didn't know her well. I used to think it was just one of her quirks but she must have read that somewhere.
If someone answers honestly, it could sure be an icebreaker in the conversation; you'd know each other lots better afterwards.
You would! I always just said, "Absolutely fine! And yours?" Hers were always good too. :-)
"I'd like to buy a bowel, Pat."

What is a muddy complexion?