Yet another reason
why the paper clip sucks.
Even if you turn off all the options in Microsoft Word that would display that annoying paper clip guy, he will still show up in one instance. If you type a short paragraph beginning with "To" and ending with a comma or colon, Mr. Paper Clip shows up and says "It looks like you are writing a letter" and offers several less-than-useful options.
Note that this can happen anywhere you type such a paragraph, even in a document which runs for several pages before that paragraph.