It really bothers me when something that I am already paying for is coated with advertisement. I don't mind commercials on TV, because I know that pays for the shows, but it bothers me when I've already paid a lot.
Movies are a good example of this. If I pay $60 to take my family to the movies, I feel like I shouldn't have to watch advertisement for 20 minutes.
The thing that really baffles me is websites that sell products having advertisements. Like on fandango, I get so inundated with their movie trailers, I can't even use this site to buy tickets sometimes. When your advertisements make it hard for me to buy your product, that's a problem.