Can my answer be in reverse? Because I can't think of anything bad that I did, but I have 3 brothers, no sisters and they certainly kept me on my toes!
Worst thing (was hard to choose!) would have to be my youngest brother kicking me, which I instinctively attempted to block with my hand and ended up with a broken pinky finger. I still cannot straighten it to this day.
What is something you hate that everyone else seems to like?