Considering that in the US we have a "game" where people sneak up behind another person and pretend (or in some cases don't pretend) to jam a gun against the back of their head, the Japanese version sounds a lot more funny. Probably a distinctly lower chance of bullets and manslaughter afterward.
But in any case, as far as Japan goes, I put it like this once: "Look, we used two suns to knock a hole in a country's cultural memory so hard that they had to invent giant radioactive dinosaurs and tentacle porn to cope with it. They're bound to be a little screwy when you break them that hard."