Other forms: red herrings
If you're a seasoned debater, you know to pounce when your opponent uses a red herring — a distracting side topic meant to divert attention from the main issue under consideration.
You might also hear this word used in the context of literature or film: a red herring in crime fiction is the conspicuous clue or suspicious character simply there to mislead you from working out who the real villain is. The sense of red herring as a deliberate distraction actually comes from the literal sense — the fish, which turns red when smoked. Red herring was used in training hounds, to identify the dogs who could detect a scent without being distracted by the stinky fish.