“Here is an appropriate use of the exclamation mark:
The last thing he expected when the elevator door opened was the snarling tiger that leapt at him.
"Ahhhhh!"
...
In almost all situations that do not involve immediate physical danger or great surprise, you should think twice before using an exclamation mark. If you have thought twice and the exclamation mark is still there, think about it three times, or however many times it takes until you delete it.”