What is the most "sibling thing" your brothers/sisters used to do to you as a kid?

What is the most sibling thing your brothers/sisters used to do to you as a kid?
As kids, my brother would hide behind any door in our house and just wait for me to walk by and scare the crap out of me. Then I started closing all the doors, especially in my parents office because their computer put your back to the door, but he would slowly open it and then silently creep up behind me and scare the s--t out of me. I hated it so bad!
What is the most "sibling thing" your brothers/sisters used to do to you as a kid?
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