For as long as you can remember, the word "no" has had a strange but not entirely negative effect on you. When spoken in a certain tone of voice, it elicits an irresistible impulse to rush right out and do whatever it is you've just been warned against doing. Try to warn any innocent bystanders against using that word in that particular tone now. It may not work, but it will make reconciling with your conscience tomorrow a lot easier.