When Paul and I decided we would be moving to Washington, we sat Graham down and asked her what she thought. She didn't think much of having "some volcano spitting rocks at me!" so we told her that if we moved, we would buy the kids a Rainbow. Finally, we've been able to do just that.
They knew we bought it, but thought that the unit would be delivered the day after we knew it would be. I really would rather not have spent the day saying "no it's not here yet."