I didn't actually say anything about it, but I did once have a really weird belief. I had just woken up, and while I was awake I hadn't shrugged off the logic posessed in Dreams. Anyways, I honestly believed that I could change my color by touching a mysterious orb on a pedestal, and that these orbs were simply littered around. I don't mean like the normal skin colors (black, white, etc.), I mean like every color in the visible spectrum. I simply had to cycle through them to find the one I wanted. It was only later that I realized how dumb this was, but I honestly believed it for an hour or so.
I also had a friend who once asked my biology teacher "Do we have veins in our arms?". She just looked at him funny. When we asked him about it, he said he just thought that the stuff you saw through your wrist was blood. Not blood being transported in anything, just blood.
The same kid also asked if "You're supposed to grow hair on your privates." She actually got mad at him for that one.
Oh, and then there's a really good one:
I was on Faethbewk (facebook), and a friend of mine asked "What's your favorite Mexican food?". Of course, the one kid in my class who consistently makes fun at himself for being Asian replies with "Sushi" as a joke. Of course, this idiot girl (who left our school, thank God) replies with "Umm, [insert friends name], I dont think sushi is mexican. pretty sure its the japs." I then asked if Facebook would implement a "disgraces to human intelligence" button, next to the "like" button.