An ad is made to sell.

Advertisers keep forgetting the main role of an advertisement.

It's not meant to amuse or entertain but to SELL.

I'm not saying that an ad shouldn't be amusing or entertaining, on the contrary, people will actually remember it more but we need to make sure that the joke is selling the product, that the product or the idea are at the core of the joke.

If an ad just makes you laugh and doesn't make you buy the product, well then it's a flop.