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What's The Meanest Thing You've Ever Done To Your Sibling?

But don't tell mom.

Anyone who grew up with siblings knows firsthand just how brutal they can be.

Whether you were the victim or the perpetrator, siblings possess the ability to be uniquely evil to one another.

Perhaps you peed in your brother's vaporizer while he slept, and he woke up to a room full of pee mist.

Maybe your sister hid your family's dog in the bathroom and convinced you that he ran away.

Or maybe you did unspeakable things to your siblings' toothbrushes when they weren't around and watched in satisfaction as they brushed with them later.

Share your horrible sibling story in the dropbox below for a chance to be featured in an upcoming BuzzFeed Community post or video!