Frenzy

Frenzy is a condition that can be inflicted upon certain creatures in Fallout 3. 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. A message notification will inform the player if a target has been frenzied.

Robots
(Via targeting their "Combat Inhibitor")
 * Protectrons
 * Robobrains
 * Mister Handys
 * Mister Gutsys
 * Sentry Bots

Insects
(Targetable antennae)
 * Giant ant
 * Fire ant
 * Bloatfly (Brain)†

Abominations

 * Deathclaw (Enclave-controlled, target the metal head piece)

Turrets
(Targetable sensor)
 * Automated Turret

† Ridiculously difficult to pull off, as Bloatflies have such a lack of health that any weapon can kill them in one shot.