We had an intern at our company for a week, a smart guy who is graduating from high school, and he pointed out all of these things about me. I also manically tap caps lock with my left pinkie.
I'd rather not think about this part of me too much, especially when it comes to picking browser based on how it renders (manically) selected paragraphs.
Chrome 6 on OS X, triple-clicking on the word "WebKit":
I dislike it when something like WSJ puts those 'learn more' links after you highlight something right under the cursor.
Notice that you will hardly or never do this on narrow columns of text.
(Yes, I know it looks like a questionable URL, but it's all I could find since, as I said, it was deleted).
Also, this would be really to filter out, the amount of highlighted areas would just be ridiculously large.