If a lurker may make a related observation: I tried the Word Trivia, and it asked me what an incubus was. Now, as a veteran Nethack player, I know that an incubus is a male demon that comes down to earth to sleep with women. Accordingly, I chose "demon" from the list of choices, and was told that the correct answer is "nightmare". http://www.dictionary.com/ informs me that an incubus can also be a nightmare or a nightmarish burden, so I think this is a highly ambiguous question and should probably be deleted.

Ekat"Nethack addict"erin