Here's one of my favorites for working with intonation. Knowing where to put the emphasis and how to use the language you choose can really have a huge impact on your speech presentation. That's why this week is about emphasis. See if you can read the following sentence so that it makes sense:
"If two witches watched two watches, which witch would watch which watch?"
Now do it 3 times in a row, altering your intonation each time.