NFL Football. It's easy to follow too, with just games on Sunday and one on Monday night. Doesn't get in the way of real life that way.
Basketball, nothing matters till the last two minutes, baseball I can't stay awake, it's like watching Seniors Golf. Hockey's great but the season is too damn long. The playoff seem like an entire season. Hard to get excited about a game when there are still 70 more to go in the season.