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
There is a display error with this perk. The +5DT will be shown in your PIP-Boy menu whenever you have a melee or unarmed (including no weapon) weapon equipped. However, the added DT will correctly only apply against melee or unarmed attacks, regardless of what you have equipped.

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