You might refuse to do it, but I doubt you'd ever actually completely fail it. If someone offered to pay $10 million if someone could go into a house, make a cup of coffee, and come back out with it, I imagine just about any functional adult would figure out a way to return with a cup of some sort of liquid resembling coffee. I don't see anyone saying, "Sorry, making a cup of coffee is too difficult, I'm going to forfeit the $10 million."

But sure, without proper compensation a lot of people would probably just say "I can't do it" as a way of avoiding the task.