I am a psychologist working with families who require help with their children’s behaviour. I have done a number of home visits with a particular family where the mother is honestly as close to the "perfect parent" as you will ever get. There is nothing I can offer her as a psych in terms of behaviour management, as she is doing everything exactly as I'd recommend. The child I am seeing is four and has Asperger's. His sister, who mum thinks is harder to cope with because she is more unpredictable, is 7ish and has ODD behaviours but not all the time - the kind of kid who goes from angel to nightmare "for no apparent reason". I recently did a home visit and I have never seen anything like it. The girl was sitting there with me chatting away happily, fantastic manners, considerate, playing with her younger brother which such patience etc. Mum fed her homebrand two minute noodles with chicken seasoning ... I kid you not, within 15 minutes, this little angel turned into a whining, defiant, out of it kid who was climbing on furniture, pushing and hitting her brother, screaming in frustration at absolutely nothing and demanding more  noodles. She traced some numbers and mum was taken back by her carelessness and messy job, which she said occurs periodically. It was quite astounding, and I wish I had been able to get that on camera!  - by email.