Whether we want to believe it or not - we are ALL influenced by advertising in some means or fashion, which is exactly why so many companies spend BIG money when it comes to catchy and memorable slogans, logos, commercials etc.
My graphic art teacher once told us - half jokingly and half very serious, that as graphic designers we should learn to develop a code of ethics and stick with them, because it is people in our profession that shape the world. We influence people's decisions on everything from what they wear to what they eat and then wash those clothes/plates with ;)
I know as a graphic communications major I learned to pinpoint the more subtle ways advertisements lure you in - the stuff you don't think of from the use of a particular font to certain color schemes, photo angles, page/screen placement etc. This is all in addition to the plays on your emotions and appeals to your needs and desires!
Celebrities and jingles are the obvious ones - it's the subtleties that will get ya! ;) Learning graphic comm has helped me to truly understand just how much sway media/advertisers have over people and it was kind of frightening - interesting though! :)