Here is a Cultural Literacy worksheet on the linguistic concept of spoonerism. This is half-page worksheet with a three-sentence reading and three comprehension questions. I can’t remember now why I prepared this; I suspect it will have relatively low utility in most classrooms, but who knows? I cannot in good faith argue that high school students, my own purview, need to understand what a spoonerism is, let alone know or care about William Archibald Spooner.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.