It will probably surprise many of you to know that Rainman isn't actually mentally deficient (we have had him tested). In fact, he has been put in several of the gifted classes at his school, is very athletic and can be quite articulate and charming...apparently. This makes me gravely concerned for the other 120 odd kids in his year. Below is very typical of the conversations I have with Rainman 20 - 30 times a day.
Rainman while swinging badly on a swing. (How can you not be able to operate a swing? I didn't even know it possible): Do you have a piece of cloth?
Me: No. Why would I bring a piece of cloth to the park?
Rainman: Because you don't have my hat in your bag.
Rainman: For you to hold onto and for me to try and grab but you didn't bring anything so it doesn't even matter now. Rainman suddenly becomes extremely petulant at my horrendous neglect.
Now this is reminiscent of conversations such as the public argument because he wouldn't accept that the milkshake flavour was caramel not camel as he insisted, or the time he got mages (popular in fantasy novels and games) and paramedics mixed up but would not concede that paramedics can't alter time.