What makes a good commercials?

So as I was saying in a previous, I went to the shopping mole and, I waited for my mum to choose cloth. Without realizing it, I began to pay attention to the commercials for this particular shopping moles. After hearing it three times, I surprised myself of being able to remember almost half of the commercial. The way this commercial was pronounced was particularly annoying but I realize now that it is probably one of the reasons why I remember it so well. In general, there are so many commercials on the loudspeaker (usually with the same voice, or close to the same) that try to make you buy something that most people (at least me) do not even pay attention to what it talks about. However, this commercial, although very annoying, was different from the other and this allowed me to remember it. So after realizing I remembered the commercial, I began to think about what makes a good commercial. Difference and repetition are the two things I came up with to answer this question. What do you think? Do not hesitate to give you opinion about this post!!