The activity of cow tipping is generally accepted as an urban legend, due to the fact that cows don't sleep while standing up and pushing over an awake cow would be extremely difficult. Thankfully (for our entertainment) this only applies to boring, regular, non-mutated cows. In Fallout 2, Fallout Tactics, Fallout 3 and Fallout: New Vegas, it's possible go around Brahmin tipping. In the modern games, it's possible to do this by pressing the activate button on an unsuspecting Brahmin while your weapons are holstered and pressing 'Activate'. The Brahmin will then collapse before standing upright after a few moments. In New Vegas, the act counts towards the 'Knocked Up' challenge.
