Do you think that Linus only focusing on Linux kernel? Well, think twice, as he has now developed a silly time-limiter for the kids' internet usage (that's what he mentioned on his GIT repository). This application can be used to limit the internet usage of his children in order to make them strict on time, so they can work their home works and not playing on the Internet all the time.
Do you know what's the reason why he developed that program? Look at his blog post.