Amazon - buy with one click?

Soooo there's this new feature on Amazon called buy with one click. I didn't really think that this was true so I tried it. I searched for one of those eeePC and said buy with one click. I was really doubting Amazon, I at least thought it would say would you like to confirm your order? Well anyway, the next page said thanks for your purchase and the item will ship soon. I was like WOAH seriously? Then I remembered that they probably charged my Moms credit card since its linked with my account. Now I have to figure out how to get this order cancelled... Uhoh