The exclamatory form emphasizes a statement (either declarative or imperative) with an exclamation point (!).

感叹句通过感叹号(！)对一个陈述(陈述句或祈使句中)进行了强调。

youdao

He sometimes spices things up by capitalizing "no" or adding an exclamation point.

WSJ: New York Mets: Did the Mets Lose? Probably

You'll need a password of 7 to 12 characters, one uppercase, one lowercase, one number and, preferably, one character like an exclamation point or ampersand.

FORBES: Magazine Article

Rep. Steve Israel of New York, chairman of the Democratic Congressional Campaign Committee and a former public-relations manager, said he prefers the period over an exclamation point or nothing at all.

WSJ: Punctuation Nerds Stopped