No googling.

    Which of the following statements are true?

    1. At least one of these ten statements is false.
    2. At least two of these ten statements are false.
    3. At least three of these ten statements are false.
    4. At least four of these ten statements are false.
    5. At least five of these ten statements are false.
    6. At least six of these ten statements are false.
    7. At least seven of these ten statements are false.
    8. At least eight of these ten statements are false.
    9. At least nine of these ten statements are false.
    10. At least ten of these ten statements are false.

I believe 1-5 true and 6-10 false is the only solution. (inb4 undefined problem because of self-reference)