I used to think the game was what people watched, and the commercials were entertainments to allow the teams to do whatever it is that teams do.
But, these commercials are what many people (myself included) watch instead of or with the game.
These are two of the favorites:
My favorite commercial is of NFL reception with football players. NFL forbids using it, but you can go to this site:
youtube.com/watch?v=rENmkc2cUxA
You have never been at a reception like this one!