If it's part of a playlist, I think it's because you've seen two or more of the videos in said playlist. And it's a looooooong playlist full of a lot of meme-like videos, so chances are you have indeed seen at least one or two in passing. Shows up in my recs all the time as well. x_x
Also @Burritoad: your video autoplays. You may want to edit that as a link to the video rather than an embed.