Intensifiers convey emphasis. Remember, some mailing systems only handle plain text, so you can't use features like italics, boldface, underlining, and font changes. So use caps sparingly. Emoticons, or icons that express emotion, are better known as smileys. These face-like symbols made from ordinary punctuation marks describe the writer's mood or appearance.
Smileys help clarify intent and avoid misunderstandings.
The original smiley appeared around 1980. Over the years, hundreds of silly variants have evolved. I'm surprised or have a big mouth. My lips are sealed. I wear horned-rimmed glasses.