(The following was deleted from Wikipedia -- really.)
From COW TIPPING
The worst kind of cow tipping is on wild cows. Wild cows are hard to find, however are wildly unpredictable .[sic] You never know what a wild cow's defenses are. They may spit blood, or even venomous toxins into your eyes in order to disable you. Once disabled, they may try to eat your internal organs.
If you succeed in tipping a cow only partway, such that only one of its feet is still on the ground, you have created lean beef. Such a feat is well done. Naturally, being outside, the cow is unstable. When it falls over, it becomes ground beef.