Brand new PSP back when they first came out. I don't even know how I broke it. I played with it, sat it down, and then when I picked it back up later the screen was cracked all over and screwed up. Luckily they exchanged it for me at the store.
I've broken every handheld system I've owned. I don't mean to of course, but when you playing SP and your brother jumps on top of you, making the knuckles of my thumbs go into the screen. I could go on with stories but I've bored you enough.
I killed one of my old graphics cards, two computer hard drives, one computer case, several speakers, several PS2 controllers... and the mirror of my uncle's 1999 impreza WRX (that's what you get out in the woods driving like a rally driver :P)