How do you top the Scuba Cat? You Don't. So you just use him again. That's what HowStuffWorks.com did in its latest campaign, bringing back the famous diving cat in an online video campaign designed to promote HowStuffWorks as the leading site for answering all the world's how-to questions. Spots, including those with a wheelchair skateboarder and a skydiving car, have driven about 3 million new visitors to the site's home page by highlighting the brand proposition of the site.