A Case Mod, I think.

OK, so when I build a computer, I typically assemble all the parts outside of the case to make sure they work, because it can be a hassle to install everything into the case, only to discover that one component is broken and needs to come out again.

That's what these guys did, only they forgot to install the components in the case when they were done.

And then they sprayed everything with polyurethane foam.

The result is certainly interesting. Kind of the Frankenstein version of Disneyland's Matterhorn. I'd say it definitely puts a damper on the upgrade possibilities.