Yes,I have an experience.I met the advertiser from one company ha has an unethical behavior because ha made commercials for product comparison of other unjustly.I think it wrong and i try to warn him what he has done is affecting to the consumer.Ethical is just procedure detemined to behave but it is not the law that you have to follow.Somebody do unethical but is not be against the law.Ethical is mean conscious stuff of humen.However every profession should have ethical it not only advertiser.