If you are the type who eats out regularly, one day a stranger might join you at the table. This stranger will always appear to be of your age and sex, and he (if it is a he) will only appear if you are alone. No matter what style of restaurant it is, he will always be carrying his own plate of food.
After a few seconds, he will look directly at you and say, "You seem like an interesting person. May I know you better?" Say yes, and he will begin to ask you questions about yourself in between bites. These questions will be innocuous enough at first: what your name is, what you do for a living, and so forth, but should you open your mouth to answer, you will be forced to tell the truth, even if you do not consciously know what the truth is. Remain silent, and the stranger will scowl at you, pick up his plate, and leave. You will never see him again. If you do indulge his questions, however, they will grow darker and darker as the food leaves his plate, and it will become harder and harder to resist answering. Do not attempt to leave the table before he does under any circumstances.
When his plate is clean, he will stand up to leave, but not before asking you one last, irresistible question: "What would drive you to take your own life?" You will instantly be aware that you will be able to lie in response to this one question, and I suggest you do, for whatever you describe will come to pass within the week. Those who are canny may use this chat to gain whatever they desire, but know that if the happenstance you name does not drive you to suicide, the stranger will start guessing as to what will. And consider how much he now knows about you.