In the vain of Hyakugojuuichi there's Yatta!. The actual Yatta is from a comedy skit here in Japan making fun of Japanese music idols among other things. Specifically probably Morning Musume. If you think American made idols like Britany Spears or Backstreet Boys you haven't seen anything.

I found Yatta through Arstechnica and they also pointed out Strong Bad which had me rolling in the aisles.