We've all heard that cliche scnenario question, "If you were stranded on a desert island and you could only bring one thing, what would it be?" If you're asking me what I would bring, that implies that I know beforehand that I'm going to be stranded on an island, since I'm planning ahead what I'm bringing. So why would you even go? I wont have to worry about choosing a wise item if I don't go to begin with :P.
Another one that is stupid-"Would you have sex with so-and-so if they were the last person on earth? To save the species?" Two people can't save the species, unless there is mass incest. Let's say you had a boy and a girl, they'd have to do eachother to procreate, and so on. Most of the time when family members have kids together, the children come out deformed in some way. So the new human race, if they could even survive, would all be deformed and originated from one mother and father.