There are some people who speak so elegantly, and you can't quite put a finger on why, or how. This book posits that it's as easy as substituting a few of your common utterances with more poetic equivalents. There are a lot of "that's brilliant!" moments, but there were a few suggested phrases that sounded pretentious. So use with care, or you'll come across as a little fusty.
This is like that other book "15,000 Useful Phrases", only this one isn't as florid.