The second of Bob's merchandising team. Sadly, a Sideshow Bob water-action pen never materialised in real life. Perhaps if it had, Bob would have held onto it himself, and not had to write so many notes in blood.

I think a "water-action pen" is one of those pens that shows a different image on the side when you turn it upside-down, by the way. One of the biggest novelties of the 1990s, now barely ever seen.
This post is part of my "Every Simpsons Character Ever" series. For a list of my rules in this project, click here.