The NicoNico-loving among you are probably aware of this fairly profound video already, but for everybody else: I present to you Supoo (スプー). Supoo is, simply put, a wondrous monstrosity of an alien that children were taught to draw on Japanese airwaves several years ago. Accompanying the drawing is a wondrous song that actually does mention that Supoo likes watermelones and bananas, but you don't need to understand a word of it to really comprehend why Supoo is such a, er, beloved creature on much of the Japanese-speaking Internet.
And as a bonus, those who are especially hardcore may have already recognized the corresponding parody from the very wonderfully psychotic anime Sayonara, Zetsubou-Sensei.
Truly, I learned Japanese so I could comprehend this stuff. Yep. Definitely.