XKCD Isn't Funny - #1590 - The Source
The hell kind of white void house does Randy live in? It's like Martin's alien blue sex cube but boring. And it hurts the joke, too. The guy should hear the high-pitched hum, check several of his electronic devices which aren't The Source, and then see the HPHG (High-Pitched Hum Generator).
But instead, we don't know there's a high pitched hum until we see the HPHG (Harry Potter & the Horrible Gorrible). The joke becomes as the decor in Randy's House: bland and nondescript.
And of course The Source is the HPHG (Hungry Patriots Hate Golf), it's the only thing he owns! Why would it have been plugged in at all? Unless it's a really bad white noise generator and he realized he doesn't want it anymore, in which case this is just a really boring story about a guy who bought a broken thing.
Also if you haven't heard, Ghost is back and you all need to spread it around like WAULDFAUR