Translated the fud for ze plebs:
* Bitcoins only exist digitally. Unlike gold, they have no physical substance or backing. There is no country behind them.
* You can buy them, but you won't know if you can sell them later. No one is obliged to accept them as payment.
* The Bitcoin price is extremely volatile. You could lose everything you put into it, so we recommend against it.
* There is no protection against theft. Keep your passwords and computer safe, or you could end up with no money and no access to your coins.
* Bitcoins waste a lot of energy. One purchase currently uses about the same amount of electricity as a two-person family does for six months.