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    21 Hilarious Tumblr Posts Only People With Sisters Will Get

    "One time my sister turned around to me and said 'You know what? We've never been formally introduced.'"

    1. This betrayal of trust:

    2. This need for sleep:

    3. This terrifying threat:

    4. This expression:

    5. This eye-opener:

    6. This sick burn:

    7. This other sick burn:

    8. This appropriate response:

    9. This inspiration:

    10. This unfounded fear:

    11. This excellent pun:

    12. This wonderful accident:

    13. This terrible lie:

    14. This downfall:

    15. This fair and reasoned reaction:

    16. This hangover cure:

    17. This incredible act:

    18. This iconic moment in the history of sisterhood:

    19. This mystery:

    20. This terrifying expression:

    21. This scapegoat: