If you are looking for a quiet, creepy, meditative interactive experience for your Sunday afternoon, my recommendation is “Glitchhikers”, available for pay-what-you-want on http://glitchhikers.com/ for Windows or OS X.

Errant Signal does a great piece on what it is, and how it is, but I find the deconstruction breaks a lot of the initial experience of the game, so if you’ve already played it or don’t intend to, it’s here: http://www.errantsignal.com/blog/?p=697