A logical fallacy is usually what has happened when someone is wrong about something. It's a flaw in reasoning. They're like tricks or illusions of thought, and they're often very sneakily used by politicians and the media to fool people. Don't be fooled! This website and poster have been designed to help you identify and call out dodgy logic wherever it may raise its ugly, incoherent head. If you see someone committing a logical fallacy, link them to the relevant fallacy to school them in thinky awesomeness and win the intellectual affections of those who happen across your comment by appearing clever and interesting e.g. yourlogicalfallacyis.com/strawman (rollover/click icons above).
Just in time for the political season :)