Hundreds of pupils at a school in Huddersfield have received detention.
It is all because they have forgotten to bring things like pencils, protractors and a rubber to class with them.
During the Easter holiday parents received text messages saying that if their child forgot an item of stationary they would be punished. The school has introduced the policy as it believes pupils borrowing from others is disruptive.
Tania Fabregas' daughter, Amelia, was given an hour's detention for forgetting a pencil sharpener.
Over 250 pupils have received detention for forgetting items this week.