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
Prior to patch 1.4.0.525, this perk was bugged. Rather than increase your DT versus melee and unarmed attacks, it would instead increase your DT if you had a melee or unarmed skill type weapon equipped. New engine functionality in the patch allowed for this perk to be corrected, and it now functions as intended.

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