One day, Mrs Arnold, a teacher at Green Barn Infant School, Norwich, England, was attempting to teach the names of animals to a class of 5-year-olds.

Firstly she held up a picture of a deer, and asked one boy, 'Sammy, what is this animal?'

Sammy looked at the picture with a disheartened look on his face and responded, 'I'm sorry Mrs Arnold, I don't know.'

Mrs Arnold was not one to give up easily, so she then asked Sammy, 'Well, Sammy, what does your Mummy call your Daddy?'

Sammy's face suddenly brightened up, but then a confused look spread slowly, and he asked, 'Mrs Arnold, is that really a pig?'