http://www.artprize.org/nick-jakubiak/2012/old-tired-crow
You can read the entire article here: http://www.npr.org/2012/11/01/163949969/reading-125-titles-a-year-thats-one-for-the-books
What I'm envisioning for a lesson on puns and wordplay is assembling a collection of contemporary artworks, current news stories with playful titles and passages, and other pun-ny pop culture references, and rolling it out as a whole class, talking through each one, one-by-one. It would generate a lot of discussion, and, once they get a feel for it, laughs. The students will be impressed with how clever they are for getting the joke, and it might make reading more enjoyable as they'll be on the lookout for playful, slippery language. This activity could prep you for identifying and analyzing wordplay in the texts you read and inspire students to start using it in their own writing and speech.