JOKE-OGRAPHY:
Joseph is packing the mule for the Holy Family's escape from Bethlehem to Egypt (a continuation of the other comics this month). The mule declares that he shall bear the burden of the Holy Family as Jesus will one day bear the burden of mankind by dying for our sins. Joseph is put off not only by the mule's dedication to the family and prophetic talents, but also by his linguistic aptitude, as mule's in that part of the world did not often speak. The mule quickly retreats back to the norms of the time by uttering an animal sound, rather than man-words, but in his haste, he utters the sounds a cow makes (rendered "moo" in English), rather than the very well-known sound a mule ought to make. You... you know the one.