I got a used computer case in a second hand hardware store and it still has the sticker with the specs of the computer they wanted to sell it with on it. It was going to be a moderate to shity pc. I built an absolute computing monster in it (i7 6900k, 32GB ram, 23TB storage). I like having visitors over and telling them this is the primary computer I use to do my high particle count fluid simulations and little bigdata projects with.