Warning: Exposure to computer screens for long periods can make users act strangely, like making strange little symbols with keyboard characters.
Surfers of the Internet know them as "emoticons" or "smileys," a computer-speak of symbols expressing gestures and emotions.
"They're cute little pictures," says David Sanderson, 30, a computer scientist from Wisconsin who compiled a book on smileys. "The actual reason why I started collecting them is a reason that only a computer geek would understand. I wanted to use them as my prompts."