As a young child I remember telling my dad I thought baseball was boring because you didn't have to think or use strategy, just hit the ball and run. He gently but firmly corrected me and taught me that baseball is the thinking man's game. I still don't really get in to watching it but I've had more respect for it since then.
To me there is no sport that better exemplifies this idea than curling. To the naive observer it just looks like sliding stones down a sheet of ice. But when you understand the game, and level that professionals are able to play at, the strategy and depth of thought involved is simply astounding. It is like chess on ice.