1. Scared Straight visit to the circus
  2. Threaten suicide
  3. Appeal to his humanity
  4. Tell him/her they "cannot" talk back or break a rule (this is like telling a List Apper they cannot do any more lists--they will prove you a liar)
    Suggested by @natanya
  5. Ask him or her "why" as if the answer to the question will lead to a solution.
    Suggested by @natanya
  6. It doesn't work when you fool yourself into thinking they will outgrow their autism.
    Suggested by @PassiveAggressor
  7. Mock them
    (In a different language if you're worried abt their self esteem)
    Suggested by @ameliaville