Another good book on Asperger's is
The Complete Guide To Asperger's Syndrome by Tony Atwood.
I must say that Tony is awesome! We've been to a few of his conferences and he's so informative and such a great interpreter for individuals with Asperger's Syndrome.
My daughter is similar. She's 14 now but is still very concrete. For her, its either black or white...no in betweens. If I call the van a car, she tells me I am lying. I have had many situations with her that are similar to the one you describe about Chitty Chitty Bang Bang. Sharing is hard for her and I think part of it is the concept of understanding that they aren't giving the object away for good and that the other person will give it back. Since the concept is hard to grasp, it causes them loads of anxiety and then the meltdown. My daughter has actually gotten better with this over time but if her mood is off, she can't handle sharing or letting anyone borrow anything. She's also likely to march to her sisters room and demand back the item she willingly shared just 2 minutes before. In her eyes, the object is "hers" and no one elses. And if it is hers and no one elses, why should she let someone else use it? At least thats how I read her. I think getting the movie back was a good thing and it may be beneficial to have some practice runs with sharing where someone will "borrow" something but only keep it for a few minutes and bring it back. Then repeat it over and over and start extending the time the object is away from her as she gets used to it being out of sight.
