How Billy Collins plays with word choice in the poem "Litany"

If I were to have read Collins' "remix" of the poem Litany, it would not have had the same affect on me.  However, seeing him perform it really emphasized his diction, and made it comical.  Collins' has a very monotone voice delivering no waver of excitement at all while he reads his version of Litany, which was a love poem.  The poem was just a list of comparisons about Litany, and how she is like objects like the dew on the morning grass.  However, Collins' version was saying everything she is not, therefore his lack luster voice really made his poem funny.