Have you ever heard of Gudetama? He's a character developed by Sanrio, the folks who brought us Hello Kitty. Believe it or not, Gudetama is an egg yolk, and he's unbelievably popular in Japan.
It just goes to show that there are no stupid concepts anymore. Gudetama's popularity is a convergence of many factors, many of them exclusive to Japan, as explained by Vox. -via Viral Viral Videos