My friend wanted me to build him a really cheap PC back in the day. So we got a Core 2 Duo and some medium range GPU, but literally gimped on everything else from HD to PSU to the case(OMG THE CASE). The case would have been more sturdy if it had used aluminum cans. It looked cool but i probably had 10 scrapes on my arm after finishing.
What's incredible though, the machine is in my parents' garage(he moved and left it with me). It's been neglected to hell, Pepsi spilled all over and beaten and scratched... STILL WORKS!