Stonewall (Fallout: New Vegas)

Stonewall is a Fallout 2, Fallout: New Vegas, Fallout Tactics and J.E. Sawyer's Fallout Role-Playing Game Perk.

You are much less likely to be knocked down in combat.

Fallout: New Vegas
You gain +5 to your Damage Threshold against all Melee Weapons and Unarmed attacks, and you cannot be knocked down by any means in combat.

Bugs
Rather than increasing your DT versus melee and unarmed attacks, it increases the player's DT as long as he/she has a melee or unarmed skill type weapon equipped.

Behind the scenes
The picture used is a reference The Thing, a member of the Marvel Comics superhero team The Fantastic Four.