Punctuation: Exclamation Point
An exclamation point ( ! ) is used to end a sentence expressing strong emotion or commands (Stop!), and may be used to close questions that are meant to convey extreme emotion (What were you thinking!).
Put an exclamation point inside closing quotation marks when the punctuation applies to the quotation itself and outside when it applies to the whole sentence.
Can you believe he said, "You're my best friend"!
He said, "You're my best friend!"
Exclamation points should be used very sparingly, and never end a sentence with more than one exclamation point!!!!!! Does that apply to question marks, too????? Yes!!!!!!!