Butter knife (Fallout 3)

The butter knife is an item in Fallout 3 and Fallout: New Vegas

Fallout 3
This item is useful only as Rock-It Launcher ammunition. Because it has weight, it is not as useful as other sources of ammunition which have zero weight. Butter knives can be found in containers and houses around the Wasteland. There are two types of butter knives: one long and thin, and another which has a wider cutting edge.