Brian Williams lost his job as anchor of the NBC Nightly News for perpetuating one fiction, and for failing to perpetuate another. The first fiction you're probably familiar with. Last winter, Williams was caught for having repeated a tall tale about his experiences embedded with U.S. troops on a helicopter in the 2003 Iraq War.
If you are Rh-, then you are - - (one negative came from mom and one from dad). If both parents are Rh+ and have mixed genes (+ -), then it is possible that each of them will give the - gene to their child, making the child Rh- (- -). So, to answer your question. Two Rh+ parents can have an Rh- child.....
1 Vatic Note: Another interesting RH neg article that actually surprised me. RH neg is a non dominant gene issue and thus it would take both parents having one each RH neg to make an RH neg baby, but a positive would have to have one positive and one negative to make a positive since RH positive is a dominant in the results. This below says its more than that. Its a good read. Check it out.