Stereotypes are easy to draw from, because there are so many. I chose to use stereotypes of a more fictional and comical nature. I am not trying to make fun of the Japanese, just the stereotypes placed upon them.
Okay I'll now summarize all the stereotypes I have included.
The nuke being dropped has "Sony" written on it, because everything in Japan is made by Sony.
The guy under the nuke is "Corn" of JSRF: Jet Set Radio Future, the game that's a Japanese stereotype within itself.
There's the DDR Megadome, home of Japanese's official game, Dance Dance Revolution.
There's an EVA from Evangelion, drawn by ~neko-bri-bri, because events from that show happen on a daily basis in Japan, and across the picture is an Angel from the same show.
Above the angel is a balloon, with any old Japanese guy ever drawn in old WB cartoons. He's saying "Ah So" because that's what they all say. The Nuclear explosion, while causing 999hp damage to Japan, is also the effect of their attempts at warding off Godzilla, who is once again ruining another game of "American Baseball". Sadly the nuke fell short and landed on a pile of houses, a pile because there are so many Japanese people that they have to live like that.