A spoonerism is a transposition of sounds within a single phrase frequently used to comic effect. The term is named for Anglican cleric Rev. William A. Spooner (1844-1930), Warden of New College, Oxford, known for his frequent slips of the tongue. Legend has collected many of his attributed slips into this unlikely line:
"You have tasted two whole worms, hissed all my mystery lectures, and have been caught fighting a liar in the quad."
Dean Acheson [attrib.] (1893-1971)