A few years ago my work environment became so complex that I felt like I was spending more time trying to code, than actually coding. So I started that thing where on Sunday mornings, I would give myself a couple hours, in bed, to code something simple in vanilla js.

It was super fun, and here's the result: http://jypepin.com/lolz

A few of those were harder than others and forced me to re-learn some basic maths. I really recommend doing such a thing sometimes!