I did not know... that this was possible... in Off Topic
It's a pretty old video.
The problem with that is if you use vegetable oil, you need to flush and refill the system every month or so.
Mineral Oil... I think you can get away with fewer refilling.
Also, If I recall correctly, that system doesn't really offer an advantage over air cooling.
It definitely looks cool though.
I can't imagine how much of a pain it would be to haul that to LAN parties.