Here are some classic examples of spoonerisms:
* "You have hissed all my mystery lectures" (instead of "You have missed all my history lectures")
* "A blushing crow" (instead of "A crushing blow")
* "The dean's weary" (instead of "The wean's dreary")
Spoonerisms can be intentional for humor, or they can be unintentional, occurring due to a slip of the tongue. They are often considered to be a type of malapropism, which is a misuse of words that often creates humorous or nonsensical phrases.