A paper bag goes to the doctors for an examination, and is told to come back
one week later for the results. Sure enough, he returns, and the
doctor says "I've got some rather serious news for you"
"What is it?", asks the bag.
"Well, the thing is, you've got Hepatitis B."
"How can that be?", he asks,"I've never been near any infected blood."
"Well", replies the doctor, "your mother must have been a carrier.