If you're a SwF&F regular, you know John Dufresne's seventh rule of revision from Lie That Tells a Truth:
Challenge every exclamation point. Like adverbs, they are intrusive. You get, let's say, three exclamation points in your life. Use them wisely. Using an exclamation point is rather like laughing at your own joke.
Upon editing, The Heat Lightning used two of my three. Other than that, I'm pysched.