2 girls were mock-fighting with rulers and P’s ruler smashed, getting glass in D’s eye. She sued D for negligence. CA said that the test of reasonable foreseeability, proximity and fair, just and reasonable. However what was “reasonably foreseeable” was considered by reference to age and sex. In this case, although it was reasonably foreseeable to an adult that D might get injured, it was not reasonably foreseeable to a 15 year old girl. “Reasonable” is to be considered in the context of age and sex. This makes the test less objective. They could also have used the “horseplay” excuse of Blake v Galloway.