The risk of working in advertising as a creative is that you tend to think too much about selling the product. Of course, in the end that's what you want to achieve. But in order to sell the product, you have to be original and entertaining first. If a salesman comes to your door wearing a tie, you might slam the door in his face before he can even finish his first sentence. If, however the same salesman is dressed up like a clown, he grabs your attention and you're more likely to find out what he has to offer. It's that simple.
I think agencies often make the mistake that the main objective of a creative is to sell the product. It's not. The actual selling happens in the store and there are no creatives behind the counter. If you're interrupting someone's favorite TV show you better be really entertaining to make sure he watches your commercial instead of walking to the kitchen to make coffee. The power of advertising is that it can give a brand a sympathetic face, it can make people feel passionate about a package of butter. And when a product has become like a friend, consumers are more likely to buy it next time they're in the stores; even if it's more expensive than other products.
A creative who really understands the value of entertainment in advertising is my former teammate Daniel Serrano. His work is among the absolute top of the Miami Ad School and when you look at his portfolio you know that there's passion behind every piece of work. There's even a good idea in the portfolio itself. Take a look at his work here.