What's the name given to the devise where an incorrect word is used for comic effect, because it has a similar sound to the correct one? Stan Laurel does it a lot. For instance in Them Thar Hills when he and Ollie are discussing a camping trip in the hills, Ollie ask if they could get a trailer up there, to which Stan replies, "Certainly! Right up in the high multitude." I also remember a character in some film mixing a can of paint and when testing its thickness says, "Ah, yes. Just the right contingency."
Spoonerisms are when you reverse the initial letters of words in a sentence or phrase. "Today, we'll be reading from Dickens' classic novel, A Sale of Two Titties." (A Tale of Two Cities)
