When I was in grade school in the early 80's, one of the coolest things to come out was the Bic 4-color pen.
Just take a gander at these features:
Write with 4 different colors combined into one great pen.
Satisfy your need for multiple ink colors in one pen.
BIC 4-Color Pen features black, blue, red and green inks.
Enjoy a quick “clic-changing” ink mechanism.
Experience over 2.4 miles of writing ink.
Let me tell you. When I saw the commercials for this thing as a youngster, I HAD to have it. I mean, fuck, it's like 4 pens in one! Oh, you wouldn't believe how proud I was the first day I took it to school with me.
Tom: Hey, Chad. Check out this pen.
Chad: Yeah, I've heard about those things.
Tom: Look, I writing in blue ink right now. See? But now I want to be like our teacher and use red. *click*
Tom: And now I want to use green. *click* Look, I'm writing my name in green. I'm a Martian.
Chad: Radical! How much was that?
Chad: Wow! My allowance is 50 cents a week. How long will it take me to save up for one?
Tom: Um...let me see. I'm gonna use black ink to figure this one out. *click*