To express strong emotion:
* Wow! That was an amazing concert!
* Help! I'm stuck!
* Look out! There's a car coming!
To emphasize a statement:
* This is absolutely incredible!
* I told you so!
* You are not going to believe this!
To show surprise or excitement:
* You're kidding! That's amazing!
* Congratulations! You did it!
* I can't believe it!
To create a sense of urgency:
* Call the police! There's been a robbery!
* Hurry up! We're going to be late!
* Don't touch that! It's dangerous!
Important Note: Don't overuse exclamation points! Too many can make your writing seem childish or unprofessional.