This Incredibly Strange But Catchy Video Is Going Viral and We're Not Sure Why

You're witnessing viral history. And it doesn't make sense...

Infectiously-catchy earworm 'PPAP' (short for Pen-Pineapple-Apple-Pen') was performed by animal print-clad DJ Piko-Taro, a fictional character played by Japanese entertainer Kazuhiko Kosaka.

It goes like this:

"I have a pen. I have an apple. Apple-pen!
I have a pen. I have [a] pineapple. Pineapple-pen!
Apple-pen. Pineapple-pen. Pen-Pineapple-Apple-Pen."

But how did the 40-year-old DJ come up with such a bizarre song about fusing a pen with an apple and a pineapple?

"When I was making this music with play, I was [just] singing it too soon," he says.

This video already has 5.5million views!

The most important question though ... Why has it gone viral?

It has all the ingredients for a viral video formula: an addictive beat, silly lyrics and a hilariously simple dance routine to back it up.

And it was only a matter of time before the minute-long song, first uploaded onto Piko-Taro's official YouTube channel, quickly spread to Facebook.