This video is so old it's got hair on it, but apparently I managed to miss it during its boom days back around 2005, and now that I've seen it I won't be able to keep a straight face the next time I ride the Yamanote Line

http://www.in-duce.net/archives/shinbashi.swf

It's apparently the 2ch cats set to a recording of the live performance by the Ramens (ラーメンズ), but try as I might I haven't been able to scrouge up an actual video. Sigh.

And just out of curiosity, for any non-Japanese speakers out there, is that still funny if you don't speak the language? Obviously you'll miss some of the gags, but most of the comedy seems to be in timing and intonation. Here's an English translation if you're curious...