Like all weird stuff on the internet, this video above has a backstory. According to ‘halcy’ on Reddit:

It’s a combination of several 2channel / Nicovideo memes. The ones I recognize:

Overall, the thing is a parody of (a parody of, see http://www.youtube.com/watch?v=p8FfUqZSWJw) the racing scenes from the racing anime Initial D, which all look kind of like this: http://www.youtube.com/watch?v=Fv020dZXOrY. There is also a “Gutter run” in there, which is kind of the main characters signature move, where he hooks his wheels into the gutter to be able to go around the curve faster.

The dudes on the bike are from a gay wrestling porn movie. It’s popular on nicovideo and has sparked things like this: http://www.youtube.com/watch?v=h9PFoBNuNMw (NSFW, duh.)

The steamroller is from Jojos Bizzare Adventure. http://www.youtube.com/watch?v=qbArvIqZzkI

The person driving the Steamroller is Kagamine Rin, a Vocaloid personification. She and Len are somehow associated with steamrollers now, presumably because both are yellow.

The background music is also a pretty distorted Vocaloid song, see that first youtube link up there.

And with that, I hope this doesn’t ruin the rest of your weekend… [via]