Why is it necessary to show a commerical for a tv show that you are already watching? so annoying.

Dumbest thing ever, plan your commercial placement for best effect and draw people to another show on later or another day, not one you're already watching, idiots.

Actually it is just filler because they couldn't sell for profit ads to fill available time.

For snows I really liked I got excited for all of 10 seconds of the commercial when I was younger

Especially if it's trailing the next episode.i don't want to know what's going to happpen.