So maybe while you were at the Dollar Tree picking up some neon Pixy Stix knock-offs, you picked up one of these multi-colored pens, wondering how a pen could possibly write in ten different colors and what those ten colors could be. You'd marvel over the little shuttles (at least, that's what I’m going to call them, since these are called shuttle pens) and push each one down, seeing if you could get more than one shuttle to stay down at once. Then you'd sit down with a piece of paper, using each different color to scribble or write a line, deciding which one you liked best and/or would bother your teacher the most. I was a big fan of light blue.

(image via Oriental Trading)