boston kreme brulee, tacobell i tacobellini, fast food and haute cuisine collide and we take a taste test in tonight's "sign of the times". captions paid for by abc, inc. >> good evening. it is one of life's ultimate questions. should you have the right to decide how and when you die? well, tonight, you'll meet a doctor who believes you do. and he prescribes advice on everything from how to suffocate yourself to the best and most lethal narcotics. but while the infamous dr. jack kevorkian spent eight years in prison this doctor is acting with impunity and for clients from around the world. nick watt now examines a new understanding of thou shalt not kill for our series "the ten commandments". >> death a natural process. >> in a drab church hall, dr. philip nitschke is explaining how to kill oneself using a plastic bag. >> it doesn't take long before you find it very, very unpleasant. that's not how to go. >> nurse betty demonstrates the best method in a video presentation. >> we have chosen an oven bag because it fits you -- >> some of the today's crowd are terminally ill. but most a