Word Processing Shortcut

When typing a document in Microsoft Word have you ever needed to change:

this is sample text typed in the wrong case

to

THIS IS SAMPLE TEXT TYPED IN THE WRONG CASE

or

This Is Sample Text Typed In The Wrong Case

??

Sure, you can just retype it...but it's usually much faster to simply highlight the text and then hit the "Shift" + "F3" keys at the same time. Each time you press this combination, Word will cycle the text to a different one of the three font case combinations shown above.