A few months ago, when I was walking down the street somewhere (probably Oxfordshire), I saw a bus with an advertisement on the back. I was looking for a house at the time, and the advert was for an estate agency. All well and good so far... but it was so very creepy that it put me off going to that agency altogether. It featured a small child leering slightly scarily above the words "I want to find you a house". The expression on her face was that sort of horrible expression taken from a nightmare: the 'I want to know where you live' expression. Which is one of the problems with using kids in adverts: often, they just look a bit creepy. They can't help it, they're small.
This, however, is an example of a pretty damn good advert featuring some children. Sure, it's a little bit creepy when they start flying around in spacesuits, but it's not downright scary. And it's for a very good cause: The Children's Mutual, who help parents to facilitate their children in achieving their dreams.