If you think you don't have a life – working hard hours on code, spending your free time on open source projects – you need to take a look at the LineRider phenomena and rethink that.
LineRider (beta!) is flash game, or to follow its inventor more accurately, a flash toy where you draw the two dimensional course for a cute bobsledder. Complete with an amusing implementation gravity and inertia it's a fun way to waste a few minutes online.
Unless, of course, you're insane. You're welcome to go to the LineRider Squidoo Lens to browse through some of the most disturbingly elaborate skiing courses ever built for LineRider. These guys spend what must amount to weeks, if not months, of their time to build ingenious courses that will leave you in awe.
A truly humbling display of when wasting time becomes true art.