See an image with a knife that toasts the bread while cutting it.

Gryffindor: Imagine stabbing someone with that.

Ravenclaw: That would cauterize the wound, so the person wouldn't bleed. Not very helpful.

Slytherin: If you want the information, it is.

Hufflepuff: WHY WOULD YOU STAB A PERSON WHEN YOU CAN HAVE A TOAST?????