Recipe: Super-Heated Knife! is a holodisk in the Fallout: New Vegas add-on, Dead Money. It is added to the player's Pip-boy inventory after reading an entry on the maintenance network terminal storage room in the center in the Executive suites.
Played around with this the other day, and:
1 Cosmic Piece-of-Shit Knife
1 Pilot Light
1 Hot Plate
Something to hold the damn thing to cook evenly
Pre-heat oven to 450 degrees
Take 1 Knife, leave on stove!
Let simmer for 5 minutes
Watch as Knife glows red-hot
Put Knife on table, melts table
Sue scientist who made damn thing
Give it to the military?