This is totally off the topic, but the stupidest question I ever heard was when I worked in a pet store. A woman had come in with her children, and after much deliberation, purchased a little pet and some accessories. About two hours later, she called the shop to ask, "Do hamsters need water?" (Nah, they just suck the moisture out of the wood chips.)

Similarly, I once overheard a woman telling her son that they would get a goldfish because you didn't have to feed them. She left the store with fish, bowl and food, and an education. :-)