Vincent Connare designed the ubiquitous, bubbly Comic Sans typeface, but he sympathizes with the world-wide movement to ban it.

Mr. Connare has looked on, alternately amused and mortified, as Comic Sans has spread from a software project at Microsoft Corp. 15 years ago to grade-school fliers and holiday newsletters, Disney ads and Beanie Baby tags, business emails, street signs, Bibles, porn sites, gravestones and hospital posters about bowel cancer.

The font, a casual script designed to look like comic-book lettering, is the bane of graphic designers, other aesthetes and Internet geeks. It is a punch line: "Comic Sans walks into a bar, bartender says, 'We don't serve your type.'" On social-messaging site Twitter, complaints about the font pop up every minute or two. An online comic strip shows a gang kicking and swearing at Mr. Connare.

The jolly typeface has spawned the Ban Comic Sans movement, nearly a decade old but stronger now than ever, thanks to the Web. The mission: "to eradicate this font" and the "evil of typographical ignorance."