Playing with language

Do you know what chiasmus is? Nope, it's not a rare medical condition. Unless you consider humorous wordplay to be contagious. The following sentence is an example of chiasmus:
I ain't as good as I once was, but I'm as good once as I ever was. (Thank you Toby Keith)

I had never heard the term until I ran across a book titled Viva La Repartee! by Dr. Mardy Grothe. I enjoyed the book so much, I went to the associated website. From there, I found two more sites - chiasmus.com and oxymoronica.com.
Back to chiasmus. Chiasmus is defined as a reversal in the order of words in two otherwise parallel phrases. Take a look at the example above. See it? Once I had a definition, I found several more examples, sayings everyone is familiar with. "Quitters never win, winners never quit." I'm sure everyone has heard that one a time or two.

I enjoy wordplay, of any kind. This one however, fascinates me, simply because without knowing the word, I knew exactly what chiasmus was. Bet you did too.