It was the advertising & marketing classes I took in college. We used to have to watch certiain shows or movies and see if we could spot all of the ads that most people don't notice. Example: Pepsi is a huge marketer in movies, and on television but you don't see as many Pepsi commercials as coke. Yet, they spend about the same amount each year on advertising.

Edy's ice cream is another one that pays insane amounts of money to show up in scenes during a show and in the movies.

Just one of those things I notice, since I was forced to look for them. It's kind of habit now, weird I guess.