According to Wikipedia, a spoonerism is an error in speech or deliberate play on words in which corresponding consonants, vowels or morphemes are switched between two words in a phrase. As an example, A Nano in the Bush becomes A Bano in the Nush. Don't worry, this is not a nasty nano in the bush (That's an example of alliteration!)
Beware of the poison ivy when in season. As always, bring a writing instrument to sign the log.