I'd have to say it wasn't funny at all. It's a bunch of cultural references, much like scary movie, or epic movie, or what have you. The only difference is that it's directed towards geeks and nerds, or what the cultural perception of them is. Regardless, it's still not funny because it's just culture jokes, referencing things that exist. Omg, do you remember the dreamcast? That thing was crazy! But how about if you could text in Sonic Adventure! That would be insane! Right? And then some zombies attack.