So, I'm a little obsessive compulsive when it comes to reading magazines.
I've been doing this since I was in fifth grade.
I started just underlining everything with whatever pen I had handy, but then I moved on to alternating underlining and crossing out paragraphs, then sentences, then words. And I alternated patterns. Then I started connecting the lines.
Over time, I also got more specific about what pens I'd use. First it was any pen, then it was only rolling ball pens, then only Pilot Precise pens, and then only fine point Pilot Precise pens.
I don't have to do it to read something, but I enjoy it.