My brother and I actually got along really well growing up and were pretty close (and still are) but we had our moments too. We are almost 2.5 years apart; I'm the oldest.
I don't remember doing a whole lot of horrible things to eachother but I do remember one time he was being a major PITA and we started fighting and I lost my temper and poured a glass of Sprite over his head. He started chasing me as he was furious of course and he pulled my hair rather hard. My mom was pretty angry since the Sprite incident occured inside the house. We were such mature 16 and 14 year olds back then!
For the record, I have 3 other siblings but they are all much younger than me so no interesting fighting stories with them that I can recall.