Aristotelian sorites Goclenian sorites Gordian knot Scylla and Charybdis baffle bafflement bewilderment bind bother box catch-22 categorical syllogism choice of Hercules confoundment confusion corner crux deadlock difficulty discomposure disconcert disconcertedness disconcertion disconcertment disturbance embarrassment enigma enthymeme figure fix hole impasse jam knot knotty point mode modus tollens mood mystery mystification no choice node nodus nonplus only choice oxymoron paradox paralogism perplexity perturbation pickle plight pons asinorum poser pother predicament problem prosyllogism pseudosyllogism puzzle puzzlement quandary riddle rule rule of deduction scrape snooker sorites spot squeeze stalemate stew stymie syllogism teaser trouble unassuredness upset vexed question