The knife fridge magnet from ThinkGeek is one of many ferociously inventive trinkets from the ultra original retailer. The magnet promises to keep children aiming for higher grades, providing an intimidation factor to the traditional hanging of papers and tests on the refrigerator.

Whether trying to scare your children or amaze your friends, the knife fridge magnet is loads of fun. As a perfect combination of function and novelty, this sharp trinket is a must-have.