Cowtipping -- possible after all?

A few days ago I found an article about zoologist using physics to show that cowtipping is impossible. Or is it?

The Times story about cow tipping showed a quaint understanding about physics. If cows were rigid, it would have been convincing. But unless you are trying to tip a dead cow with rigor mortis, that's not what obtains.

Cows lock their legs when sleeping, but not their hips and shoulders. Unbalancing a cow does not require that you rotate the entire beast around a pivot point at its hoofs, but rather only requires that you start the torso moving at a speed from which the cow cannot recover. I assure you it is entirely possible to tip a cow.

Important safety tip: Don't try to tip a bull. They are not as tolerant as cows and they run faster than people.