Frenzy

Frenzy is a condition that can be inflicted upon certain creatures in Fallout 3 and Fallout: New Vegas. Robots, ants, and Enclave-controlled Deathclaws have certain body parts targetable in VATS, by skilled sharpshooters, or by explosives. If these parts are crippled, it will cause the target to disregard any friend-or-foe relations and attack everything indiscriminantly. When frenzied, nearby creatures will attack the frenzied creature even before it has a chance to attack them. A message notification will inform the player if a target has been frenzied.

Robots
The following robots can be frenzied by targeting and crippling their Combat inhibitors:
 * Protectrons
 * Mister Handys
 * Mister Gutsys
 * Cerberus, via dialogue with the Robotics Expert perk.
 * Sentry Bots
 * Robobrains

Insects
The following insects can be frenzied by targeting and crippling their antennae or brain:
 * Giant ant
 * Fire ant
 * Bloatfly
 * Cazador
 * Giant Mantis

Deathclaws

 * Any Enclave-controlled Deathclaw can be frenzied by targeting and crippling its metal Enclave transmitter piece.

Turrets

 * Any Automated Turret can be frenzied by targeting and crippling its Targeting Chip or Lens. If the turret is controllable by a nearby terminal, the terminal will usually contain an option to remove the turret's targeting data. This also effectively frenzies them.

Humans

 * Cook-Cook will be frenzied if his pet brahmin, Queenie, is killed before he dies.