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A Japanese song about pens and fruit is winning the internet

Get familiar with the letters "PPAP" -- you'll probably see them a lot in the weeks ahead.

Do you know what an earworm is? It's a type of song that you become inexplicably addicted to, one that you just can't get out of your head for days. Think Psy's Gangnam Style.

A new song from Japanese singer and comedian Piko Taro, real name Kazuhiko Kosaka, is the latest tune to worm its way into the internet's collective ear.

Called "PPAP", or Pen Pineapple Apple Pen, this one-minute masterpiece is all about a man and his noble quest to combine pens with various pieces of fruit, in this case an apple and a pineapple.

The clip was posted to YouTube in late August, but has gained most of its 4.5-plus million views in the last few days since being posted on 9Gag's Facebook page, where it's amassed just under 50 million views and nearly 1 million shares.

It's enjoyed plenty of love over on Twitter, thanks in part to the #PPAPchallenge that has people around the world competing to produce the best cover.