LOL!! Plus Ron's smart-ass remark, "Can I see Uranus?" This just clinches it. The books are definitely written on two levels. =P

JKR is one sneaky lady. Just like the Disney animators who draw naughty things into a couple of cells just to see if anyone is paying attention. BTW, I've heard people speculating that she named Tonks the way she did on account of all the fan-fic.