I have been thinking about this a lot lately too. I've noticed 99% of commercials are just a template, and they fill in the blanks. Unfortunately, I'm distracted with something else right now and I can't really elaborate on details, but I think you know what I mean.
However, when I see a commercial that really tries to push the envelope, it really sticks with me. Especially really,
really bizarre commercials that have little to do with the product. Those almost always have me buying the item, even if I don't want it. It probably also ties in with my sense of humor, which is a little tilted for some people