This very funny parody of a ballet pas de deux, choreographed by Christian Spuck of the Stuttgarter Ballet, has apparently become a repertoire favorite. Here are two versions. The first, from the year 2000, features Julia Krämer and Robert Tewsley , and is performed in front of a live audience. The second, with ballerina Alicia Amatriain (male dancer not identified), has no audience but better lighting and tighter camerawork. Spoiler Alert: Neither has a dancing cow, much to my disappointment.
Thanks to Ira Seidenstein for the link!