[Coach]

I think it's because sports is one of the few things were we can literally be a part of the action. We can cheer and jeer and (maybe superficially) actually affect the game. No other experience lets you scream your face off, hate people purely because they cheer for someone else, and witness people live out childhood dreams LIVE.

Also because sports can't be replayed. Of course you can tape it/watch highlights, but nothing replaces being there. And if something amazing happens, you can say "I was there". Where as pretty much any other entertainment can be repeated or postponed to be seen later.

You can't get that from movies or even plays.