Games you play through like a tradition?

I was thinking about this earlier. I tend to play through FFIX at least once or twice a year (although I haven't played it through 26 times :P) and most Christmases I break out the N64 and play through OoT. Not to mention I've completed Fire Emblem Radiant Dawn atleast twice a year since it came out. The same can be said pretty much of Tales of Symphonia. There's others on this list as well.

My question is this, are there games that you play through in an almost traditional routine and why?