The AC Unit
The AC Unit is the only thing keeping this server from bursting into flames. It's very close to whatever one might consider the AC Unit analogue of "breathing its last breath," but we can't afford a new one.
Acquisition
We got our grubby little hands on The AC Unit when we stole our current facilities from their previous proprietor. We wouldn't have kept it were it not vital to the continued health of the server.
Observations
The AC unit appears to be summoned by the inclusion of {{AC}} in a page. The science behind this behaviour is not defined.