Yep that's my MO for most sports broadcasts. I have the TV on in the background, but I putter around doing other stuff (ok, I play video games). If it sounds like something interesting is happening in the game I'll rewind the past couple minutes and then watch. I honestly had no idea whether I was seeing American or Canadian commercials. They all look the same to me TBH. Every 2 bit company can throw up realistic looking CGI to hawk their stuff these days.