A paper bag goes to the doctor and complains of feeling really ill. The doctor carries out a lot of tests and tells the paper bag to come back next week for the results.

The following week, the paper bag is severely distressed to be told by his doctor that he is HIV positive.

"BUT HOW CAN THIS BE? (he sobs) i'M ONLY A PAPER BAG!

"well, have you had unprotected sex in the last year?" asks the doctor.

"NO! HOW CAN I, I'M JUST A PAPER BAG!!"

"how about sharing needles? giving blood, anything lke that?"

"I'VE TOLD YOU BEFORE YOU CRETIN! I'M JUST A BLOODY PAPER BAG!!"

"aha" the doctor says shaking his head "as I suspected.... your mother must have been a carrier".