How do you choose what you watch?

After I see a commercial for a television show I debate whether or not I would like that show. Normally any comedy show, I would choose to watch it. I would not think into depth about a decision of what to watch, I would just wing it and see if I like it. Movies are a completely different decision for me. When I see commercials for a new movie coming out, I will decide whether it's worth my money or not. Movies are expensive these days and I would rather not waste it. Commercials show a lot about what people will be consumed in and the easiest way to get people interested.