When I was little I remember watching the movie 'Gone in 60 Seconds' and I'll never forget the scene where a Pepsi bottle is set down on a counter so the label purposely faced the camera and my mom saying "there's a million dollar commercial for Pepsi right there." Ever since then I always payed close attention to the way brands were advertised in movies. Once you notice it the first time it becomes a natural habit to point out each time a brand is used and also when a brand is altered to protect legal rights. I feel that paying to have a brand advertised in a movie is a brilliant idea because it's something that will have an affect on viewers for years to come. Plus it incorporates its brand with something the viewer already loves so they are more likely to try that brand or become loyal to it for that purpose.
Some examples of brands that use product placement in movies are:
White Castle burgers in Harold and Kumar

FedEx in Cast Away

Wonderbread in Ricky Bobby