Many parents prefer to intimidate their children saying that Santa Claus won't come, if they behave badly during the year.

许多家长都更喜欢威胁孩子，告诉孩子如果他们今年表现不好，圣诞老人就不会来。

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Although it's unlikely a person will behave differently simply because of their hair colour, they may act out of character if they are being treated badly, or according to a stereotype.

尽管一个人不太可能仅仅因为发色就举止反常，但如果别人对他们不客气，或者抱有成见，他们有可能行为不当。

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Some children are ignored when they are quiet and behaving well, so they may behave badly to get attention.

当一些孩子很安静且表现得很好时，容易被忽视。所以，他们表现出不好的行为以获得注意力。

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He said there was "always the risk of rogue individuals who behave very badly - they must be dealt with through the criminal law as has been seen with the Winterbourne View staff".

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Some children said they were bated by other children and encouraged to behave badly, just to get a reaction.

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"If I took you to a country where they were reading Sanskrit and I was writing that on the board - well anyone would behave badly - how bored would you be when you tried to follow it and all you could understand was the odd word, " says Mr Ryan.

BBC: NEWS | UK | Education | Teachers reflect on disciplining