Buzz·Posted on 3 Dec 201621 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.'"by Natalya LobanovaBuzzFeed StaffLinkFacebookPinterestTwitterMail 1. This betrayal of trust: 2. This need for sleep: 3. This terrifying threat: 4. This expression: View this post on 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: View this post on 19. This mystery: 20. This terrifying expression: 21. This scapegoat: View this post on