Once, when a few friends and I were extremely drunk, we kicked over a newly erected gravestone in the local cemetary. And burnt the flowers. That was fucking bad.
I broke my brothers nose once. He'd been pissing me off for a week beforehand, and he used to beat me up (3 years older than me). So, I tripped him up and slammed his fucking face into the wall. He hasn't touched me since, so I consider it worth it.
My brother is also a huge warhammer nerd. I collect warhammer too, but what he doesn't understand is that I don't like to talk about it ALL THE FUCKING TIME. Anyway... about a year ago he bought an emperor's champion, and spent days converting and painting it with a flowing cloak, glowing sword and scenic base. Then, every time I was in the same room as me, he would brag about it. And the rules for it. For days. And days. I pointed out this was incredibly boring and sad, and I really didn't give a flying fuck, but he wouldn't desist. Anyway, he left the house for a day, and I took the model and I painted on the cloak: DON'T GIVE A SHIT. Then I took modelling putty and converted the sword into a dildo, which I then painted bright pink.
Boy, was he pissed off.
Other than that... not much. A few practical jokes (like changing my bros boot settings so his hard drive wouldn't load), and exploiting drunk people, but thats just normal.
I know it sounds like I give my brother a lot of shit, but he is easily the most boring person on the face of the planet. He eats like a pig, washes about once a week, is too lazy to shave and can't talk without shouting and spraying spit everywhere. And he mumbles to himself while doing anything. He used to bully me, too, and punch me when he'd had a bad day at school.
He was one of the reasons I went to boarding school. The other was both me and my dad are alpha males, and he can't accept that I won't do whatever I tell him, and that I don't want to end up in a 9 til 5 like him, but do something I enjoy with my life.
This has been a great way to let off steam at other peoples expense. You must be really fucking bored by now.