well, just anything really really left field or surprising. i'm not entirely sure. someone was talking about whether or not to use the big sleep if we get a "curly" question, and i was just wondering if anyone had actually seen any of these sort of "curly" questions. all the one's i've seen seem to be at a comparable level of difficulty. so yeah, just anything ... unexpected or unusual or hugely impossible, i suppose. but i guess you haven't seen any like that, anyway.