Brahmin tipping is an action possible in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, and, in a special encounter, Fallout Tactics.
Fallout[]
In Fallout, brahmin can be tipped by using beer on them. Performing this action inflicts no damage to the brahmin.
Fallout 2[]
In Fallout 2, brahmin tipping may be done by selecting the "push" command (the palm icon) in the drop-down menu that appears when a person or item is click-held. However, this will also sometimes simply prompt the brahmin to move away. Performing this action inflicts no damage to the brahmin.
Fallout 3 and Fallout: New Vegas[]
Brahmin may be pushed over by pressing the "Activate" button while crouching either unarmed or with weapons holstered near a brahmin. This causes it to go into a ragdoll state for a few seconds before getting back up. No Karma will be lost for doing this, nor will anyone become hostile.
In Fallout 3, repeating this action may cause the brahmin to die. Even after it dies, no one will become hostile and no Karma will be lost. The resulting corpse may be looted for brahmin meat. Pack brahmin cannot be tipped; only regular brahmin can.
In Fallout: New Vegas, most brahmin can be tipped, with the exceptions being Queenie, pack brahmin, and the brahmins next to the McBride house. Tipping brahmin counts towards the "Knocked Up" challenge.
Fallout 76[]
In Fallout 76, the Nuka-World on Tour event Spin the Wheel has a chance of tasking the player with finding and tipping a number of loose Brahmin. The Brahmin can be simply tipped by pressing the interact key while next to them, which will cause them to collapse as a ragdoll.
Fallout Tactics[]
Brahmin tipping is featured as a special encounter in Fallout Tactics. During the special encounter, the player will find several brahmin surrounded by a fence. By interacting with the brahmin, the player can tip them over. Performing this action inflicts no damage to the brahmin, which will stand back up after a short time.
Behind the scenes[]
This action is a reference to the real-life urban legend of cow tipping. In the real world, cows do not sleep standing up and are actually easily disturbed. Depending on the complacency of the cow, attempting to tip one would take between two and four people to succeed.