You can never say Yes to this affirmative (yes/no) question

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I was going through a funny post from @mysdianait (do you have internet). It reminded me one of the puzzle I used to ask in my childhood days - Tell me a question where the answer will always be no, if someone answers yes then s/he is lying. The question is "Are you sleeping?" The one who is actually sleeping cannot answer and the one who is not cannot say yes. Do you know any other affirmative question which can not be answered yes or no? Another one, "are you dead? " but this is not valid as we are not going to ask a question of a dead person.